RHSA-2022:0592

Vulnerability from csaf_redhat - Published: 2022-02-22 09:17 - Updated: 2026-03-02 16:19
Summary
Red Hat Security Advisory: kpatch-patch security update
Severity
Important
Notes
Topic: An update for kpatch-patch 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: This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel. Security Fix(es): * kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466) * kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920) * kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155) * kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330) * kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942) 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.
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-2020-0466

A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

7.8 (High)
CVSS:3.1/AV:L/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 https://access.redhat.com/errata/RHSA-2022:0592
Workaround Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
CVE-2021-0920

A vulnerability was found in unix_dgram_recvmsg in net/unix/af_unix.c in the Linux kernel's garbage collection for Unix domain socket file handlers. In this flaw, a missing cleanup may lead to a use-after-free due to a race problem. This flaw allows a local user to crash the system or escalate their privileges on the system. A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system.

7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/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 https://access.redhat.com/errata/RHSA-2022:0592
Workaround Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVE-2021-4155

A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.

5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE-131 - Incorrect Calculation of Buffer Size
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 https://access.redhat.com/errata/RHSA-2022:0592
Workaround This issue can be mitigated by ensuring xfs_alloc_file_space is not called with "0" as an argument. This can be done with a SystemTap script (which resets "0" with XFS_BMAPI_PREALLOC), below are the steps: 1) Save the following script in a 'CVE-2021-4155.stp' file --- On Red Hat Enterprise Linux 6 --- probe module("xfs").function("xfs_alloc_file_space") { if ($alloc_type == 0) $alloc_type = 0x40; # XFS_BMAPI_PREALLOC } --- On Red Hat Enterprise Linux 6 --- --- On Red Hat Enterprise Linux 7 onwards --- probe module("xfs").function("xfs_alloc_file_space") { if ($alloc_type == 0) $alloc_type = 0x8; # XFS_BMAPI_PREALLOC } --- On Red Hat Enterprise Linux 7 onwards --- 2) Install systemtap package and its dependencies # yum install -y systemtap systemtap-runtime # yum install -y kernel-devel kernel-debuginfo 3) Build the mitigation kernel module as root. # stap -r `uname -r` -m cve_2021_4155.ko -g CVE-2021-4155.stp -p4 4) Load the mitigation module as root # staprun -L cve_2021_4155.ko What is SystemTap and how to use it? https://access.redhat.com/solutions/5441
CVE-2022-0330

A random memory access flaw was found in the Linux kernel’s GPU i915 kernel driver functionality in the way a user may run malicious code on the GPU. This flaw allows a local user to crash the system or escalate their privileges on the system.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-281 - Improper Preservation of Permissions
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 https://access.redhat.com/errata/RHSA-2022:0592
Workaround Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVE-2022-22942

A use-after-free flaw was found in the Linux kernel’s vmw_execbuf_copy_fence_user function in drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c in vmwgfx. This flaw allows a local attacker with user privileges to cause a privilege escalation problem.

7.0 (High)
CVSS:3.1/AV:L/AC:H/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 https://access.redhat.com/errata/RHSA-2022:0592
Workaround Mitigation for this issue is to skip loading the affected module vmwgfx onto the system until we have a fix available. This can be done by a blacklist mechanism and ensures the driver is not loaded at the boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~
References
https://access.redhat.com/errata/RHSA-2022:0592 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=1920480 external
https://bugzilla.redhat.com/show_bug.cgi?id=2031930 external
https://bugzilla.redhat.com/show_bug.cgi?id=2034813 external
https://bugzilla.redhat.com/show_bug.cgi?id=2042404 external
https://bugzilla.redhat.com/show_bug.cgi?id=2044809 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2020-0466 self
https://bugzilla.redhat.com/show_bug.cgi?id=1920480 external
https://www.cve.org/CVERecord?id=CVE-2020-0466 external
https://nvd.nist.gov/vuln/detail/CVE-2020-0466 external
https://access.redhat.com/security/cve/CVE-2021-0920 self
https://bugzilla.redhat.com/show_bug.cgi?id=2031930 external
https://www.cve.org/CVERecord?id=CVE-2021-0920 external
https://nvd.nist.gov/vuln/detail/CVE-2021-0920 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://www.cisa.gov/known-exploited-vulnerabilit… external
https://access.redhat.com/security/cve/CVE-2021-4155 self
https://bugzilla.redhat.com/show_bug.cgi?id=2034813 external
https://www.cve.org/CVERecord?id=CVE-2021-4155 external
https://nvd.nist.gov/vuln/detail/CVE-2021-4155 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://access.redhat.com/security/cve/CVE-2022-0330 self
https://bugzilla.redhat.com/show_bug.cgi?id=2042404 external
https://www.cve.org/CVERecord?id=CVE-2022-0330 external
https://nvd.nist.gov/vuln/detail/CVE-2022-0330 external
https://www.openwall.com/lists/oss-security/2022/… external
https://access.redhat.com/security/cve/CVE-2022-22942 self
https://bugzilla.redhat.com/show_bug.cgi?id=2044809 external
https://www.cve.org/CVERecord?id=CVE-2022-22942 external
https://nvd.nist.gov/vuln/detail/CVE-2022-22942 external
Acknowledgments
Virtuozzo Kernel team Kirill Tkhai
To clipboard 

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          "text": "A vulnerability was found in unix_dgram_recvmsg in net/unix/af_unix.c in the Linux kernel\u0027s garbage collection for Unix domain socket file handlers.  In this flaw, a missing cleanup may lead to a use-after-free due to a race problem. This flaw allows a local user to crash the system or escalate their privileges on the system.\r\n\r\nA read-after-free memory flaw was found in the Linux kernel\u0027s garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system.",
          "title": "Vulnerability description"
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          "text": "kernel: Use After Free in unix_gc() which could result in a local privilege escalation",
          "title": "Vulnerability summary"
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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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          "text": "A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.",
          "title": "Vulnerability description"
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          "text": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL",
          "title": "Vulnerability summary"
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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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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: failing usercopy allows for use-after-free exploitation"
    }
  ]
}


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Tags
Taxonomy of the tags.




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.