RHSA-2019:2741

Vulnerability from csaf_redhat - Published: 2019-09-12 13:08 - Updated: 2026-03-06 05:07
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 8. 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: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c (CVE-2019-3846) * Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS (CVE-2019-3887) * kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results (CVE-2019-9500) * kernel: Count overflow in FUSE request leading to use-after-free issues. (CVE-2019-11487) * kernel: brcmfmac frame validation bypass (CVE-2019-9503) 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): * BUG: scheduling while atomic in zswap (BZ#1726362) * kernel-rt: update to the RHEL8.0.z batch#3 source tree (BZ#1734475)
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.
CVE-2018-19824

A flaw was found In the Linux kernel, through version 4.19.6, where a local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c. An attacker could corrupt memory and possibly escalate privileges if the attacker is able to have physical access to the system.

6.6 (Medium)
CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Vendor Fix 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. https://access.redhat.com/errata/RHSA-2019:2741
CVE-2019-3846

A flaw was found in the Linux kernel's Marvell wifi chip driver. A heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c allows remote attackers to cause a denial of service(system crash) or execute arbitrary code.

8.0 (High)
CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-122 - Heap-based Buffer Overflow
Vendor Fix 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. https://access.redhat.com/errata/RHSA-2019:2741
Workaround This flaw requires a system with marvell wifi network card to be attempting to connect to a attacker controlled wifi network. A temporary mitigation may be to only connect to known-good networks via wifi, or connect to a network via ethernet. Alternatively if wireless networking is not used the mwifiex kernel module can be blacklisted to prevent misuse of the vulnerable code.
CVE-2019-3887

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Register (MSR) access with nested(=1) virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash the host kernel resulting in DoS issue.

6.7 (Medium)
CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:H
CWE-863 - Incorrect Authorization
Vendor Fix 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. https://access.redhat.com/errata/RHSA-2019:2741
CVE-2019-9500

If the Wake-up on Wireless LAN functionality is configured in the brcmfmac driver, which only works with Broadcom FullMAC chipsets, a malicious event frame can be constructed to trigger a heap buffer overflow in the brcmf_wowl_nd_results() function. This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw (CVE-2019-9503), can be used remotely. This can result in a remote denial of service (DoS). Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out.

6.5 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE-122 - Heap-based Buffer Overflow
Vendor Fix 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. https://access.redhat.com/errata/RHSA-2019:2741
CVE-2019-9503

If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and not be processed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a WiFi dongle). This can allow firmware event frames from a remote source to be processed and this can result in denial of service (DoS) condition.

5.9 (Medium)
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE-20 - Improper Input Validation
Vendor Fix 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. https://access.redhat.com/errata/RHSA-2019:2741
CVE-2019-11487

A flaw was found in the Linux kernel's implementation of the FUSE filesystem, where it allows a page reference counter overflow. If a page reference counter overflows into a negative value, it can be placed back into the "free" list for reuse by other applications. This flaw allows a local attacker who can manipulate memory page reference counters to cause memory corruption and possible privilege escalation by triggering a use-after-free condition. The current attack requires the system to have approximately 140 GB of RAM for this attack to be performed. It may be possible that the attack can occur with fewer memory requirements.

7.8 (High)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-416 - Use After Free
Vendor Fix 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. https://access.redhat.com/errata/RHSA-2019:2741
Workaround Preventing loading of the 'fuse' kernel module will prevent attackers from using this exploit against the system; howeve the functionality of being able to access the filesystems that would be allowed by fuse would no longer be allowed . See “How do I blacklist a kernel module to prevent it from loading automatically?" ( https://access.redhat.com/solutions/41278) for instructions on how to disable the 'fuse' kernel module from autoloading. This mitigation may not be suitable if access to the functionality provided by fuse is required.
References
https://access.redhat.com/errata/RHSA-2019:2741 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=1695044 external
https://bugzilla.redhat.com/show_bug.cgi?id=1701224 external
https://bugzilla.redhat.com/show_bug.cgi?id=1701842 external
https://bugzilla.redhat.com/show_bug.cgi?id=1703063 external
https://bugzilla.redhat.com/show_bug.cgi?id=1713059 external
https://bugzilla.redhat.com/show_bug.cgi?id=1726362 external
https://bugzilla.redhat.com/show_bug.cgi?id=1734475 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2018-19824 self
https://bugzilla.redhat.com/show_bug.cgi?id=1655816 external
https://www.cve.org/CVERecord?id=CVE-2018-19824 external
https://nvd.nist.gov/vuln/detail/CVE-2018-19824 external
https://www.openwall.com/lists/oss-security/2018/… external
https://access.redhat.com/security/cve/CVE-2019-3846 self
https://bugzilla.redhat.com/show_bug.cgi?id=1713059 external
https://www.cve.org/CVERecord?id=CVE-2019-3846 external
https://nvd.nist.gov/vuln/detail/CVE-2019-3846 external
https://seclists.org/oss-sec/2019/q2/133 external
https://access.redhat.com/security/cve/CVE-2019-3887 self
https://bugzilla.redhat.com/show_bug.cgi?id=1695044 external
https://www.cve.org/CVERecord?id=CVE-2019-3887 external
https://nvd.nist.gov/vuln/detail/CVE-2019-3887 external
https://access.redhat.com/security/cve/CVE-2019-9500 self
https://bugzilla.redhat.com/show_bug.cgi?id=1701224 external
https://www.cve.org/CVERecord?id=CVE-2019-9500 external
https://nvd.nist.gov/vuln/detail/CVE-2019-9500 external
https://blog.quarkslab.com/reverse-engineering-br… external
https://kb.cert.org/vuls/id/166939/ external
https://www.bleepingcomputer.com/news/security/br… external
https://access.redhat.com/security/cve/CVE-2019-9503 self
https://bugzilla.redhat.com/show_bug.cgi?id=1701842 external
https://www.cve.org/CVERecord?id=CVE-2019-9503 external
https://nvd.nist.gov/vuln/detail/CVE-2019-9503 external
https://blog.quarkslab.com/reverse-engineering-br… external
https://access.redhat.com/security/cve/CVE-2019-11487 self
https://bugzilla.redhat.com/show_bug.cgi?id=1703063 external
https://www.cve.org/CVERecord?id=CVE-2019-11487 external
https://nvd.nist.gov/vuln/detail/CVE-2019-11487 external
Acknowledgments
ADLab of Venustech huangwen
Google.com Marc Orr
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        "id": "CWE-122",
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          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s Marvell wifi chip driver. A heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c allows remote attackers to cause a denial of service(system crash) or execute arbitrary code.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Heap overflow in mwifiex_update_bss_desc_with_ie function in marvell/mwifiex/scan.c",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is currently rated as Important as it is possible for an attacker to setup a wifi access point with identical configuration in another location and intercept have the system auto connect and possibly be exploited.",
          "title": "Statement"
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        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability description"
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11487"
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      "release_date": "2019-04-22T00:00:00+00:00",
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      ],
      "title": "kernel: Count overflow in FUSE request leading to use-after-free issues."
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.