var-201906-1174
Vulnerability from variot
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363. This vulnerability stems from improper management of system resources (such as memory, disk space, files, etc.) by network systems or products. A successful exploit could cause the targeted system to crash, resulting in a DoS condition. Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. Kernel.org has confirmed the vulnerability and released software updates. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2019:1488-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1488 Issue date: 2019-06-17 CVE Names: CVE-2019-3896 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary:
An update for kernel is now available for Red Hat Enterprise Linux 6.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
- Description:
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
-
An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)
-
kernel: Double free in lib/idr.c (CVE-2019-3896)
-
Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)
-
Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
-
MDS mitigations not enabled on Intel Skylake CPUs (BZ#1710081)
-
RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1710121)
-
[RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1710517)
-
Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
- Bugs fixed (https://bugzilla.redhat.com/):
1694812 - CVE-2019-3896 kernel: Double free in lib/idr.c 1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service 1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service 1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service
- Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source: kernel-2.6.32-754.15.3.el6.src.rpm
i386: kernel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-devel-2.6.32-754.15.3.el6.i686.rpm kernel-headers-2.6.32-754.15.3.el6.i686.rpm perf-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
x86_64: kernel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm perf-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
x86_64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: kernel-2.6.32-754.15.3.el6.src.rpm
noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
x86_64: kernel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm perf-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: kernel-2.6.32-754.15.3.el6.src.rpm
i386: kernel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-devel-2.6.32-754.15.3.el6.i686.rpm kernel-headers-2.6.32-754.15.3.el6.i686.rpm perf-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
ppc64: kernel-2.6.32-754.15.3.el6.ppc64.rpm kernel-bootwrapper-2.6.32-754.15.3.el6.ppc64.rpm kernel-debug-2.6.32-754.15.3.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm kernel-devel-2.6.32-754.15.3.el6.ppc64.rpm kernel-headers-2.6.32-754.15.3.el6.ppc64.rpm perf-2.6.32-754.15.3.el6.ppc64.rpm perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
s390x: kernel-2.6.32-754.15.3.el6.s390x.rpm kernel-debug-2.6.32-754.15.3.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debug-devel-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm kernel-devel-2.6.32-754.15.3.el6.s390x.rpm kernel-headers-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-devel-2.6.32-754.15.3.el6.s390x.rpm perf-2.6.32-754.15.3.el6.s390x.rpm perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
x86_64: kernel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm perf-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386: kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
ppc64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm python-perf-2.6.32-754.15.3.el6.ppc64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm
s390x: kernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm python-perf-2.6.32-754.15.3.el6.s390x.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm
x86_64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source: kernel-2.6.32-754.15.3.el6.src.rpm
i386: kernel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-devel-2.6.32-754.15.3.el6.i686.rpm kernel-headers-2.6.32-754.15.3.el6.i686.rpm perf-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm
x86_64: kernel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm perf-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
i386: kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm
x86_64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- References:
https://access.redhat.com/security/cve/CVE-2019-3896 https://access.redhat.com/security/cve/CVE-2019-11477 https://access.redhat.com/security/cve/CVE-2019-11478 https://access.redhat.com/security/cve/CVE-2019-11479 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/tcpsack
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2019 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce .
Bug Fix(es):
-
Mistmach between 'tty->termios->c_lflag' and 'ldata->icanon' for 'ICANON' (BZ#1708061)
-
RHEL7: rwsem reader/writer mutual exclusion guarantee may not work (BZ#1709702)
-
hardened usercopy is causing crash (BZ#1712311)
-
[RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712991)
-
[RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712996)
-
WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713002)
-
[debug kernel] [x86_64]INFO: possible circular locking dependency detected (BZ#1715326)
-
RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)
Enhancement(s):
-
[MCHP 7.7 FEAT] Update smartpqi driver to latest upstream (BZ#1709467)
-
========================================================================== Ubuntu Security Notice USN-4041-1 June 29, 2019
linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon update
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in the Linux kernel. Unfortunately, the update introduced a regression that interfered with networking applications that setup very low SO_SNDBUF values. This update fixes the problem.
We apologize for the inconvenience.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 19.04: linux-image-5.0.0-1010-aws 5.0.0-1010.11 linux-image-5.0.0-1010-azure 5.0.0-1010.10 linux-image-5.0.0-1010-gcp 5.0.0-1010.10 linux-image-5.0.0-1010-kvm 5.0.0-1010.11 linux-image-5.0.0-1012-raspi2 5.0.0-1012.12 linux-image-5.0.0-1016-snapdragon 5.0.0-1016.17 linux-image-5.0.0-20-generic 5.0.0-20.21 linux-image-5.0.0-20-generic-lpae 5.0.0-20.21 linux-image-5.0.0-20-lowlatency 5.0.0-20.21 linux-image-aws 5.0.0.1010.10 linux-image-azure 5.0.0.1010.9 linux-image-gcp 5.0.0.1010.10 linux-image-generic 5.0.0.20.21 linux-image-generic-lpae 5.0.0.20.21 linux-image-gke 5.0.0.1010.10 linux-image-kvm 5.0.0.1010.10 linux-image-lowlatency 5.0.0.20.21 linux-image-raspi2 5.0.0.1012.9 linux-image-snapdragon 5.0.0.1016.9 linux-image-virtual 5.0.0.20.21
Ubuntu 18.10: linux-image-4.18.0-1015-gcp 4.18.0-1015.16 linux-image-4.18.0-1016-kvm 4.18.0-1016.17 linux-image-4.18.0-1018-raspi2 4.18.0-1018.21 linux-image-4.18.0-1020-aws 4.18.0-1020.24 linux-image-4.18.0-1023-azure 4.18.0-1023.24 linux-image-4.18.0-25-generic 4.18.0-25.26 linux-image-4.18.0-25-generic-lpae 4.18.0-25.26 linux-image-4.18.0-25-lowlatency 4.18.0-25.26 linux-image-4.18.0-25-snapdragon 4.18.0-25.26 linux-image-aws 4.18.0.1020.20 linux-image-azure 4.18.0.1023.25 linux-image-gcp 4.18.0.1015.15 linux-image-generic 4.18.0.25.26 linux-image-generic-lpae 4.18.0.25.26 linux-image-gke 4.18.0.1015.15 linux-image-kvm 4.18.0.1016.16 linux-image-lowlatency 4.18.0.25.26 linux-image-powerpc-e500mc 4.18.0.25.26 linux-image-powerpc-smp 4.18.0.25.26 linux-image-powerpc64-emb 4.18.0.25.26 linux-image-powerpc64-smp 4.18.0.25.26 linux-image-raspi2 4.18.0.1018.15 linux-image-snapdragon 4.18.0.25.26 linux-image-virtual 4.18.0.25.26
Ubuntu 18.04 LTS: linux-image-4.15.0-1017-oracle 4.15.0-1017.19 linux-image-4.15.0-1036-gcp 4.15.0-1036.38 linux-image-4.15.0-1036-gke 4.15.0-1036.38 linux-image-4.15.0-1038-kvm 4.15.0-1038.38 linux-image-4.15.0-1040-raspi2 4.15.0-1040.43 linux-image-4.15.0-1043-aws 4.15.0-1043.45 linux-image-4.15.0-1045-oem 4.15.0-1045.50 linux-image-4.15.0-1057-snapdragon 4.15.0-1057.62 linux-image-4.15.0-54-generic 4.15.0-54.58 linux-image-4.15.0-54-generic-lpae 4.15.0-54.58 linux-image-4.15.0-54-lowlatency 4.15.0-54.58 linux-image-4.18.0-1023-azure 4.18.0-1023.24~18.04.1 linux-image-4.18.0-25-generic 4.18.0-25.26~18.04.1 linux-image-4.18.0-25-generic-lpae 4.18.0-25.26~18.04.1 linux-image-4.18.0-25-lowlatency 4.18.0-25.26~18.04.1 linux-image-4.18.0-25-snapdragon 4.18.0-25.26~18.04.1 linux-image-aws 4.15.0.1043.42 linux-image-azure 4.18.0.1023.21 linux-image-gcp 4.15.0.1036.38 linux-image-generic 4.15.0.54.56 linux-image-generic-hwe-18.04 4.18.0.25.74 linux-image-generic-lpae 4.15.0.54.56 linux-image-generic-lpae-hwe-18.04 4.18.0.25.74 linux-image-gke 4.15.0.1036.39 linux-image-gke-4.15 4.15.0.1036.39 linux-image-kvm 4.15.0.1038.38 linux-image-lowlatency 4.15.0.54.56 linux-image-lowlatency-hwe-18.04 4.18.0.25.74 linux-image-oem 4.15.0.1045.49 linux-image-oracle 4.15.0.1017.20 linux-image-powerpc-e500mc 4.15.0.54.56 linux-image-powerpc-smp 4.15.0.54.56 linux-image-powerpc64-emb 4.15.0.54.56 linux-image-powerpc64-smp 4.15.0.54.56 linux-image-raspi2 4.15.0.1040.38 linux-image-snapdragon 4.15.0.1057.60 linux-image-snapdragon-hwe-18.04 4.18.0.25.74 linux-image-virtual 4.15.0.54.56 linux-image-virtual-hwe-18.04 4.18.0.25.74
Ubuntu 16.04 LTS: linux-image-4.15.0-1017-oracle 4.15.0-1017.19~16.04.2 linux-image-4.15.0-1036-gcp 4.15.0-1036.38~16.04.1 linux-image-4.15.0-1043-aws 4.15.0-1043.45~16.04.1 linux-image-4.15.0-1049-azure 4.15.0-1049.54 linux-image-4.15.0-54-generic 4.15.0-54.58~16.04.1 linux-image-4.15.0-54-generic-lpae 4.15.0-54.58~16.04.1 linux-image-4.15.0-54-lowlatency 4.15.0-54.58~16.04.1 linux-image-4.4.0-1051-kvm 4.4.0-1051.58 linux-image-4.4.0-1087-aws 4.4.0-1087.98 linux-image-4.4.0-1114-raspi2 4.4.0-1114.123 linux-image-4.4.0-1118-snapdragon 4.4.0-1118.124 linux-image-4.4.0-154-generic 4.4.0-154.181 linux-image-4.4.0-154-generic-lpae 4.4.0-154.181 linux-image-4.4.0-154-lowlatency 4.4.0-154.181 linux-image-4.4.0-154-powerpc-e500mc 4.4.0-154.181 linux-image-4.4.0-154-powerpc-smp 4.4.0-154.181 linux-image-4.4.0-154-powerpc64-emb 4.4.0-154.181 linux-image-4.4.0-154-powerpc64-smp 4.4.0-154.181 linux-image-aws 4.4.0.1087.90 linux-image-aws-hwe 4.15.0.1043.43 linux-image-azure 4.15.0.1049.52 linux-image-gcp 4.15.0.1036.50 linux-image-generic 4.4.0.154.162 linux-image-generic-hwe-16.04 4.15.0.54.75 linux-image-generic-lpae 4.4.0.154.162 linux-image-generic-lpae-hwe-16.04 4.15.0.54.75 linux-image-gke 4.15.0.1036.50 linux-image-kvm 4.4.0.1051.51 linux-image-lowlatency 4.4.0.154.162 linux-image-lowlatency-hwe-16.04 4.15.0.54.75 linux-image-oem 4.15.0.54.75 linux-image-oracle 4.15.0.1017.11 linux-image-powerpc-e500mc 4.4.0.154.162 linux-image-powerpc-smp 4.4.0.154.162 linux-image-powerpc64-emb 4.4.0.154.162 linux-image-powerpc64-smp 4.4.0.154.162 linux-image-raspi2 4.4.0.1114.114 linux-image-snapdragon 4.4.0.1118.110 linux-image-virtual 4.4.0.154.162 linux-image-virtual-hwe-16.04 4.15.0.54.75
After a standard system update you need to reboot your computer to make all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. 7) - x86_64
- Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Bug Fix(es):
-
kernel-rt: update to the RHEL8.0.z batch#1 source tree (BZ#1704955)
-
7) - aarch64, noarch, ppc64le
-
Advisory
ID: NFLX-2019-001
Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities
Release Date: 2019-06-17
Severity: Critical
Overview:
Netflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels.
The vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. The most serious, dubbed “SACK Panic,” allows a remotely-triggered kernel panic on recent Linux kernels.
There are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective. We recommend that affected parties enact one of those described below, based on their environment.
Details:
1: CVE-2019-11477: SACK Panic (Linux >= 2.6.29)
Description: A sequence of SACKs may be crafted such that one can trigger an integer overflow, leading to a kernel panic.
Fix: Apply the patch PATCH_net_1_4.patch. Additionally, versions of the Linux kernel up to, and including, 4.14 require a second patch PATCH_net_1a.patch.
Workaround #1: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing
sysctl is set to 0, which appears to be the default value for that sysctl).
Workaround #2: Disable SACK processing (/proc/sys/net/ipv4/tcp_sack
set to 0).
(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)
2: CVE-2019-11478: SACK Slowness (Linux < 4.15) or Excess Resource Usage (all Linux versions)
Description: It is possible to send a crafted sequence of SACKs which will fragment the TCP retransmission queue. On Linux kernels prior to 4.15, an attacker may be able to further exploit the fragmented queue to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection.
Fix: Apply the patch PATCH_net_2_4.patch
Workaround #1: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing
sysctl is set to 0, which appears to be the default value for that sysctl).
Workaround #2: Disable SACK processing (/proc/sys/net/ipv4/tcp_sack
set to 0).
(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)
3: CVE-2019-5599: SACK Slowness (FreeBSD 12 using the RACK TCP Stack)
Description: It is possible to send a crafted sequence of SACKs which will fragment the RACK send map. An attacker may be able to further exploit the fragmented send map to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection.
Workaround #1: Apply the patch split_limit.patch and set the net.inet.tcp.rack.split_limit
sysctl to a reasonable value to limit the size of the SACK table.
Workaround #2: Temporarily disable the RACK TCP stack.
(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)
4: CVE-2019-11479: Excess Resource Consumption Due to Low MSS Values (all Linux versions)
Description: An attacker can force the Linux kernel to segment its responses into multiple TCP segments, each of which contains only 8 bytes of data. This drastically increases the bandwidth required to deliver the same amount of data. Further, it consumes additional resources (CPU and NIC processing power). This attack requires continued effort from the attacker and the impacts will end shortly after the attacker stops sending traffic.
Fix: Two patches PATCH_net_3_4.patch and PATCH_net_4_4.patch add a sysctl which enforces a minimum MSS, set by the net.ipv4.tcp_min_snd_mss
sysctl. This lets an administrator enforce a minimum MSS appropriate for their applications.
Workaround: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing
sysctl is set to 0, which appears to be the default value for that sysctl).
Note:
Good system and application coding and configuration practices (limiting write buffers to the necessary level, monitoring connection memory consumption via SO_MEMINFO, and aggressively closing misbehaving connections) can help to limit the impact of attacks against these kinds of vulnerabilities.
Acknowledgments:
Originally reported by Jonathan Looney.
We thank Eric Dumazet for providing Linux fixes and support.
We thank Bruce Curtis for providing the Linux filters.
We thank Jonathan Lemon and Alexey Kodanev for helping to improve the Linux patches.
We gratefully acknowledge the assistance of Tyler Hicks in testing fixes, refining the information about vulnerable versions, and providing assistance during the disclosure process
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This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363. This vulnerability stems from improper management of system resources (such as memory, disk space, files, etc.) by network systems or products. A successful exploit could cause the targeted system to crash, resulting in a DoS condition. \nProof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. \nKernel.org has confirmed the vulnerability and released software updates. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Important: kernel security and bug fix update\nAdvisory ID: RHSA-2019:1488-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2019:1488\nIssue date: 2019-06-17\nCVE Names: CVE-2019-3896 CVE-2019-11477 CVE-2019-11478\n CVE-2019-11479\n====================================================================\n1. Summary:\n\nAn update for kernel is now available for Red Hat Enterprise Linux 6. \n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64\nRed Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64\nRed Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64\nRed Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64\nRed Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64\n\n3. Description:\n\nThe kernel packages contain the Linux kernel, the core of any Linux\noperating system. \n\nSecurity Fix(es):\n\n* An integer overflow flaw was found in the way the Linux kernel\u0027s\nnetworking subsystem processed TCP Selective Acknowledgment (SACK)\nsegments. While processing SACK segments, the Linux kernel\u0027s socket buffer\n(SKB) data structure becomes fragmented. To efficiently process SACK blocks, the Linux\nkernel merges multiple fragmented SKBs into one, potentially overflowing\nthe variable holding the number of segments. A remote attacker could use\nthis flaw to crash the Linux kernel by sending a crafted sequence of SACK\nsegments on a TCP connection with small value of TCP MSS, resulting in a\ndenial of service (DoS). (CVE-2019-11477)\n\n* kernel: Double free in lib/idr.c (CVE-2019-3896)\n\n* Kernel: tcp: excessive resource consumption while processing SACK blocks\nallows remote denial of service (CVE-2019-11478)\n\n* Kernel: tcp: excessive resource consumption for TCP connections with low\nMSS allows remote denial of service (CVE-2019-11479)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nBug Fix(es):\n\n* MDS mitigations not enabled on Intel Skylake CPUs (BZ#1710081)\n\n* RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1710121)\n\n* [RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1710517)\n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect. \n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1694812 - CVE-2019-3896 kernel: Double free in lib/idr.c\n1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service\n1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service\n1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service\n\n6. Package List:\n\nRed Hat Enterprise Linux Desktop (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\ni386:\nkernel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-headers-2.6.32-754.15.3.el6.i686.rpm\nperf-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Desktop Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux HPC Node (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux HPC Node Optional (v. 6):\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Server (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\ni386:\nkernel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-headers-2.6.32-754.15.3.el6.i686.rpm\nperf-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nppc64:\nkernel-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-bootwrapper-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debug-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-devel-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-headers-2.6.32-754.15.3.el6.ppc64.rpm\nperf-2.6.32-754.15.3.el6.ppc64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\n\ns390x:\nkernel-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debug-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm\nkernel-devel-2.6.32-754.15.3.el6.s390x.rpm\nkernel-headers-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-devel-2.6.32-754.15.3.el6.s390x.rpm\nperf-2.6.32-754.15.3.el6.s390x.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nppc64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\npython-perf-2.6.32-754.15.3.el6.ppc64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\n\ns390x:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\npython-perf-2.6.32-754.15.3.el6.s390x.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\ni386:\nkernel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-headers-2.6.32-754.15.3.el6.i686.rpm\nperf-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2019-3896\nhttps://access.redhat.com/security/cve/CVE-2019-11477\nhttps://access.redhat.com/security/cve/CVE-2019-11478\nhttps://access.redhat.com/security/cve/CVE-2019-11479\nhttps://access.redhat.com/security/updates/classification/#important\nhttps://access.redhat.com/security/vulnerabilities/tcpsack\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2019 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\nl+p3rcEBzDA=NzJu\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. \n\nBug Fix(es):\n\n* Mistmach between \u0027tty-\u003etermios-\u003ec_lflag\u0027 and \u0027ldata-\u003eicanon\u0027 for \u0027ICANON\u0027\n(BZ#1708061)\n\n* RHEL7: rwsem reader/writer mutual exclusion guarantee may not work\n(BZ#1709702)\n\n* hardened usercopy is causing crash (BZ#1712311)\n\n* [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update\n(BZ#1712991)\n\n* [RHEL7] MDS mitigations are not enabled after double microcode update\n(BZ#1712996)\n\n* WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90\n__static_key_slow_dec+0xa6/0xb0 (BZ#1713002)\n\n* [debug kernel] [x86_64]INFO: possible circular locking dependency\ndetected (BZ#1715326)\n\n* RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)\n\nEnhancement(s):\n\n* [MCHP 7.7 FEAT] Update smartpqi driver to latest upstream (BZ#1709467)\n\n4. ==========================================================================\nUbuntu Security Notice USN-4041-1\nJune 29, 2019\n\nlinux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon update\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 19.04\n- Ubuntu 18.10\n- Ubuntu 18.04 LTS\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in the Linux kernel. \nUnfortunately, the update introduced a regression that interfered with\nnetworking applications that setup very low SO_SNDBUF values. This\nupdate fixes the problem. \n\nWe apologize for the inconvenience. \n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 19.04:\n linux-image-5.0.0-1010-aws 5.0.0-1010.11\n linux-image-5.0.0-1010-azure 5.0.0-1010.10\n linux-image-5.0.0-1010-gcp 5.0.0-1010.10\n linux-image-5.0.0-1010-kvm 5.0.0-1010.11\n linux-image-5.0.0-1012-raspi2 5.0.0-1012.12\n linux-image-5.0.0-1016-snapdragon 5.0.0-1016.17\n linux-image-5.0.0-20-generic 5.0.0-20.21\n linux-image-5.0.0-20-generic-lpae 5.0.0-20.21\n linux-image-5.0.0-20-lowlatency 5.0.0-20.21\n linux-image-aws 5.0.0.1010.10\n linux-image-azure 5.0.0.1010.9\n linux-image-gcp 5.0.0.1010.10\n linux-image-generic 5.0.0.20.21\n linux-image-generic-lpae 5.0.0.20.21\n linux-image-gke 5.0.0.1010.10\n linux-image-kvm 5.0.0.1010.10\n linux-image-lowlatency 5.0.0.20.21\n linux-image-raspi2 5.0.0.1012.9\n linux-image-snapdragon 5.0.0.1016.9\n linux-image-virtual 5.0.0.20.21\n\nUbuntu 18.10:\n linux-image-4.18.0-1015-gcp 4.18.0-1015.16\n linux-image-4.18.0-1016-kvm 4.18.0-1016.17\n linux-image-4.18.0-1018-raspi2 4.18.0-1018.21\n linux-image-4.18.0-1020-aws 4.18.0-1020.24\n linux-image-4.18.0-1023-azure 4.18.0-1023.24\n linux-image-4.18.0-25-generic 4.18.0-25.26\n linux-image-4.18.0-25-generic-lpae 4.18.0-25.26\n linux-image-4.18.0-25-lowlatency 4.18.0-25.26\n linux-image-4.18.0-25-snapdragon 4.18.0-25.26\n linux-image-aws 4.18.0.1020.20\n linux-image-azure 4.18.0.1023.25\n linux-image-gcp 4.18.0.1015.15\n linux-image-generic 4.18.0.25.26\n linux-image-generic-lpae 4.18.0.25.26\n linux-image-gke 4.18.0.1015.15\n linux-image-kvm 4.18.0.1016.16\n linux-image-lowlatency 4.18.0.25.26\n linux-image-powerpc-e500mc 4.18.0.25.26\n linux-image-powerpc-smp 4.18.0.25.26\n linux-image-powerpc64-emb 4.18.0.25.26\n linux-image-powerpc64-smp 4.18.0.25.26\n linux-image-raspi2 4.18.0.1018.15\n linux-image-snapdragon 4.18.0.25.26\n linux-image-virtual 4.18.0.25.26\n\nUbuntu 18.04 LTS:\n linux-image-4.15.0-1017-oracle 4.15.0-1017.19\n linux-image-4.15.0-1036-gcp 4.15.0-1036.38\n linux-image-4.15.0-1036-gke 4.15.0-1036.38\n linux-image-4.15.0-1038-kvm 4.15.0-1038.38\n linux-image-4.15.0-1040-raspi2 4.15.0-1040.43\n linux-image-4.15.0-1043-aws 4.15.0-1043.45\n linux-image-4.15.0-1045-oem 4.15.0-1045.50\n linux-image-4.15.0-1057-snapdragon 4.15.0-1057.62\n linux-image-4.15.0-54-generic 4.15.0-54.58\n linux-image-4.15.0-54-generic-lpae 4.15.0-54.58\n linux-image-4.15.0-54-lowlatency 4.15.0-54.58\n linux-image-4.18.0-1023-azure 4.18.0-1023.24~18.04.1\n linux-image-4.18.0-25-generic 4.18.0-25.26~18.04.1\n linux-image-4.18.0-25-generic-lpae 4.18.0-25.26~18.04.1\n linux-image-4.18.0-25-lowlatency 4.18.0-25.26~18.04.1\n linux-image-4.18.0-25-snapdragon 4.18.0-25.26~18.04.1\n linux-image-aws 4.15.0.1043.42\n linux-image-azure 4.18.0.1023.21\n linux-image-gcp 4.15.0.1036.38\n linux-image-generic 4.15.0.54.56\n linux-image-generic-hwe-18.04 4.18.0.25.74\n linux-image-generic-lpae 4.15.0.54.56\n linux-image-generic-lpae-hwe-18.04 4.18.0.25.74\n linux-image-gke 4.15.0.1036.39\n linux-image-gke-4.15 4.15.0.1036.39\n linux-image-kvm 4.15.0.1038.38\n linux-image-lowlatency 4.15.0.54.56\n linux-image-lowlatency-hwe-18.04 4.18.0.25.74\n linux-image-oem 4.15.0.1045.49\n linux-image-oracle 4.15.0.1017.20\n linux-image-powerpc-e500mc 4.15.0.54.56\n linux-image-powerpc-smp 4.15.0.54.56\n linux-image-powerpc64-emb 4.15.0.54.56\n linux-image-powerpc64-smp 4.15.0.54.56\n linux-image-raspi2 4.15.0.1040.38\n linux-image-snapdragon 4.15.0.1057.60\n linux-image-snapdragon-hwe-18.04 4.18.0.25.74\n linux-image-virtual 4.15.0.54.56\n linux-image-virtual-hwe-18.04 4.18.0.25.74\n\nUbuntu 16.04 LTS:\n linux-image-4.15.0-1017-oracle 4.15.0-1017.19~16.04.2\n linux-image-4.15.0-1036-gcp 4.15.0-1036.38~16.04.1\n linux-image-4.15.0-1043-aws 4.15.0-1043.45~16.04.1\n linux-image-4.15.0-1049-azure 4.15.0-1049.54\n linux-image-4.15.0-54-generic 4.15.0-54.58~16.04.1\n linux-image-4.15.0-54-generic-lpae 4.15.0-54.58~16.04.1\n linux-image-4.15.0-54-lowlatency 4.15.0-54.58~16.04.1\n linux-image-4.4.0-1051-kvm 4.4.0-1051.58\n linux-image-4.4.0-1087-aws 4.4.0-1087.98\n linux-image-4.4.0-1114-raspi2 4.4.0-1114.123\n linux-image-4.4.0-1118-snapdragon 4.4.0-1118.124\n linux-image-4.4.0-154-generic 4.4.0-154.181\n linux-image-4.4.0-154-generic-lpae 4.4.0-154.181\n linux-image-4.4.0-154-lowlatency 4.4.0-154.181\n linux-image-4.4.0-154-powerpc-e500mc 4.4.0-154.181\n linux-image-4.4.0-154-powerpc-smp 4.4.0-154.181\n linux-image-4.4.0-154-powerpc64-emb 4.4.0-154.181\n linux-image-4.4.0-154-powerpc64-smp 4.4.0-154.181\n linux-image-aws 4.4.0.1087.90\n linux-image-aws-hwe 4.15.0.1043.43\n linux-image-azure 4.15.0.1049.52\n linux-image-gcp 4.15.0.1036.50\n linux-image-generic 4.4.0.154.162\n linux-image-generic-hwe-16.04 4.15.0.54.75\n linux-image-generic-lpae 4.4.0.154.162\n linux-image-generic-lpae-hwe-16.04 4.15.0.54.75\n linux-image-gke 4.15.0.1036.50\n linux-image-kvm 4.4.0.1051.51\n linux-image-lowlatency 4.4.0.154.162\n linux-image-lowlatency-hwe-16.04 4.15.0.54.75\n linux-image-oem 4.15.0.54.75\n linux-image-oracle 4.15.0.1017.11\n linux-image-powerpc-e500mc 4.4.0.154.162\n linux-image-powerpc-smp 4.4.0.154.162\n linux-image-powerpc64-emb 4.4.0.154.162\n linux-image-powerpc64-smp 4.4.0.154.162\n linux-image-raspi2 4.4.0.1114.114\n linux-image-snapdragon 4.4.0.1118.110\n linux-image-virtual 4.4.0.154.162\n linux-image-virtual-hwe-16.04 4.15.0.54.75\n\nAfter a standard system update you need to reboot your computer to make\nall the necessary changes. \n\nATTENTION: Due to an unavoidable ABI change the kernel updates have\nbeen given a new version number, which requires you to recompile and\nreinstall all third party kernel modules you might have installed. \nUnless you manually uninstalled the standard kernel metapackages\n(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,\nlinux-powerpc), a standard system upgrade will automatically perform\nthis as well. 7) - x86_64\n\n3. Description:\n\nThe kernel-rt packages provide the Real Time Linux Kernel, which enables\nfine-tuning for systems with extremely high determinism requirements. \n\nBug Fix(es):\n\n* kernel-rt: update to the RHEL8.0.z batch#1 source tree (BZ#1704955)\n\n4. 7) - aarch64, noarch, ppc64le\n\n3. # Advisory\n###### ID: NFLX-2019-001\n\n###### Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities\n\n###### Release Date: 2019-06-17\n\n###### Severity: Critical\n\n### Overview:\n\nNetflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels. \n\nThe vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. The most serious, dubbed _\u201cSACK Panic_,\u201d allows a remotely-triggered kernel panic on recent Linux kernels. \n\nThere are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective. We recommend that affected parties enact one of those described below, based on their environment. \n\n### Details:\n\n#### 1: [CVE-2019-11477](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11477): SACK Panic (Linux \u003e= 2.6.29)\n\n__Description:__\nA sequence of SACKs may be crafted such that one can trigger an integer overflow, leading to a kernel panic. \n\n__Fix:__ Apply the patch [PATCH_net_1_4.patch](2019-001/PATCH_net_1_4.patch). Additionally, versions of the Linux kernel up to, and including, 4.14 require a second patch [PATCH_net_1a.patch](2019-001/PATCH_net_1a.patch). \n\n__Workaround #1:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n__Workaround #2:__ Disable SACK processing (`/proc/sys/net/ipv4/tcp_sack` set to 0). \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 2: [CVE-2019-11478](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478): SACK Slowness (Linux \u003c 4.15) or Excess Resource Usage (all Linux versions)\n\n__Description:__ It is possible to send a crafted sequence of SACKs which will fragment the TCP retransmission queue. On Linux kernels prior to 4.15, an attacker may be able to further exploit the fragmented queue to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection. \n\n__Fix:__ Apply the patch [PATCH_net_2_4.patch](2019-001/PATCH_net_2_4.patch)\n\n__Workaround #1:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n__Workaround #2:__ Disable SACK processing (`/proc/sys/net/ipv4/tcp_sack` set to 0). \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 3: [CVE-2019-5599](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5599): SACK Slowness (FreeBSD 12 using the RACK TCP Stack)\n\n__Description:__ It is possible to send a crafted sequence of SACKs which will fragment the RACK send map. An attacker may be able to further exploit the fragmented send map to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection. \n\n__Workaround #1:__ Apply the patch [split_limit.patch](2019-001/split_limit.patch) and set the `net.inet.tcp.rack.split_limit` sysctl to a reasonable value to limit the size of the SACK table. \n\n__Workaround #2:__ Temporarily disable the RACK TCP stack. \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 4: [CVE-2019-11479](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11479): Excess Resource Consumption Due to Low MSS Values (all Linux versions)\n\n__Description:__ An attacker can force the Linux kernel to segment its responses into multiple TCP segments, each of which contains only 8 bytes of data. This drastically increases the bandwidth required to deliver the same amount of data. Further, it consumes additional resources (CPU and NIC processing power). This attack requires continued effort from the attacker and the impacts will end shortly after the attacker stops sending traffic. \n\n__Fix:__ Two patches [PATCH_net_3_4.patch](2019-001/PATCH_net_3_4.patch) and [PATCH_net_4_4.patch](2019-001/PATCH_net_4_4.patch) add a sysctl which enforces a minimum MSS, set by the `net.ipv4.tcp_min_snd_mss` sysctl. This lets an administrator enforce a minimum MSS appropriate for their applications. \n\n__Workaround:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n\n### Note:\nGood system and application coding and configuration practices (limiting write buffers to the necessary level, monitoring connection memory consumption via SO_MEMINFO, and aggressively closing misbehaving connections) can help to limit the impact of attacks against these kinds of vulnerabilities. \n\n\n## Acknowledgments:\nOriginally reported by Jonathan Looney. \n\nWe thank Eric Dumazet for providing Linux fixes and support. \n\nWe thank Bruce Curtis for providing the Linux filters. \n\nWe thank Jonathan Lemon and Alexey Kodanev for helping to improve the Linux patches. \n\nWe gratefully acknowledge the assistance of Tyler Hicks in testing fixes, refining the information about vulnerable versions, and providing assistance during the disclosure process", "sources": [ { "db": 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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.