rhsa-2021:2316
Vulnerability from csaf_redhat
Published
2021-06-08 22:44
Modified
2025-02-28 01:27
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
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.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362)
* kernel: Use after free via PI futex state (CVE-2021-3347)
* kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c (CVE-2020-8648)
* kernel: Improper input validation in some Intel(R) Graphics Drivers (CVE-2020-12363)
* kernel: Null pointer dereference in some Intel(R) Graphics Drivers (CVE-2020-12364)
* kernel: Speculation on pointer arithmetic against bpf_context pointer (CVE-2020-27170)
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):
* lru-add-drain workqueue on RT is allocated without being used (BZ#1894587)
* kernel-rt: update to the latest RHEL7.9.z source tree (BZ#1953118)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
{ document: { aggregate_severity: { namespace: "https://access.redhat.com/security/updates/classification/", text: "Important", }, category: "csaf_security_advisory", csaf_version: "2.0", distribution: { text: "Copyright © Red Hat, Inc. All rights reserved.", tlp: { label: "WHITE", url: "https://www.first.org/tlp/", }, }, lang: "en", notes: [ { category: "summary", text: "An update for kernel-rt is now available for Red Hat Enterprise Linux 7.\n\nRed 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.", title: "Topic", }, { category: "general", text: "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* kernel: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362)\n\n* kernel: Use after free via PI futex state (CVE-2021-3347)\n\n* kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c (CVE-2020-8648)\n\n* kernel: Improper input validation in some Intel(R) Graphics Drivers (CVE-2020-12363)\n\n* kernel: Null pointer dereference in some Intel(R) Graphics Drivers (CVE-2020-12364)\n\n* kernel: Speculation on pointer arithmetic against bpf_context pointer (CVE-2020-27170)\n\nFor 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.\n\nBug Fix(es):\n\n* lru-add-drain workqueue on RT is allocated without being used (BZ#1894587)\n\n* kernel-rt: update to the latest RHEL7.9.z source tree (BZ#1953118)", title: "Details", }, { category: "legal_disclaimer", text: "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", title: "Terms of Use", }, ], publisher: { category: "vendor", contact_details: "https://access.redhat.com/security/team/contact/", issuing_authority: "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", name: "Red Hat Product Security", namespace: "https://www.redhat.com", }, references: [ { category: "self", summary: "https://access.redhat.com/errata/RHSA-2021:2316", url: "https://access.redhat.com/errata/RHSA-2021:2316", }, { category: "external", summary: "https://access.redhat.com/security/updates/classification/#important", url: "https://access.redhat.com/security/updates/classification/#important", }, { category: "external", summary: "1802559", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1802559", }, { category: "external", summary: "1894587", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1894587", }, { category: "external", summary: "1922249", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1922249", }, { category: "external", summary: "1930246", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1930246", }, { category: "external", summary: "1930249", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1930249", }, { category: "external", summary: "1930251", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1930251", }, { category: "external", summary: "1940627", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1940627", }, { category: "self", summary: "Canonical URL", url: "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2316.json", }, ], title: "Red Hat Security Advisory: kernel-rt security and bug fix update", tracking: { current_release_date: "2025-02-28T01:27:47+00:00", generator: { date: "2025-02-28T01:27:47+00:00", engine: { name: "Red Hat SDEngine", version: "4.3.1", }, }, id: 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This flaw allows a local user to crash the system.", title: "Vulnerability description", }, { category: "summary", text: "kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c", title: "Vulnerability summary", }, { category: "other", text: "The impact is moderate, because of the need of additional privileges (usually local console user).", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", 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An integer overflow in the firmware for some Intel(R) Graphics Drivers may allow a privileged user to potentially enable an escalation of privilege via local access. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", title: "Vulnerability description", }, { category: "summary", text: "kernel: Integer overflow in Intel(R) Graphics Drivers", title: "Vulnerability summary", }, { category: "other", text: "Only users that specify i915.enable_guc=-1 or i915.enable_guc=1 or 2 are open to be exploited by this issue.\n\nDue to the full fix (combination of kernel and firmware updates) being invasive and GUC firmware loading is off by default, Red Hat Enterprise Linux kernel versions prior to the Linux kernel version shipped with Red Hat Enterprise Linux 8.4 GA (kernel-4.18.0-305.el8) print a warning in the kernel log (\"GUC firmware is insecure - CVE 2020-12362 - Please update to a newer release to get secure GUC\") and do not rely on the firmware fix. As a result, Red Hat Enterprise Linux versions prior Red Hat Enterprise Linux 8.4 GA (including Red Hat Enterprise Linux 6 and 7) do not include the updated firmware packages.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-kvm-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", 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discovery_date: "2021-03-18T00:00:00+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "1940627", }, ], notes: [ { category: "description", text: "A flaw was found in the Linux kernels eBPF verification code. By default accessing the eBPF verifier is only accessible to privileged users with CAP_SYS_ADMIN. A local user with the ability to insert eBPF instructions can use the eBPF verifier to abuse a spectre like flaw where they can infer all system memory.", title: "Vulnerability description", }, { category: "summary", text: "kernel: Speculation on pointer arithmetic against bpf_context pointer", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", 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A use-after-free memory flaw in the Fast Userspace Mutexes functionality allowing a local user to crash the system or escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", title: "Vulnerability description", }, { category: "summary", text: "kernel: Use after free via PI futex state", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.31.1.rt56.1169.el7.x86_64", 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threats: [ { category: "impact", details: "Important", }, ], title: "kernel: Use after free via PI futex state", }, ], }
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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.