RHSA-2022:0592HighCVSS 7.8

Red Hat Security Advisory: kpatch-patch security update

Published
February 22, 2022
Last Modified
August 7, 2026

🔗 CVE IDs covered (5)

CVE-2021-0920 →CVE-2021-4155 →CVE-2022-0330 →CVE-2022-22942 →CVE-2020-0466 →

📋 Description

CVE-2020-0466 — kernel: use after free in eventpoll.c may lead to escalation of privilege CVE-2021-0920 — kernel: Use After Free in unix_gc() which could result in a local privilege escalation CVE-2021-4155 — kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL CVE-2022-0330 — kernel: possible privileges escalation due to missing TLB flush CVE-2022-22942 — kernel: failing usercopy allows for use-after-free exploitation

🎯 Affected products51

  • Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_21_1-0:1-9.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_21_1-0:1-9.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_21_1-0:1-9.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_21_1-debuginfo-0:1-9.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_21_1-debuginfo-0:1-9.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_24_1-0:1-7.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_24_1-0:1-7.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_24_1-0:1-7.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_24_1-debuginfo-0:1-7.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_24_1-debuginfo-0:1-7.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_25_1-0:1-7.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_25_1-0:1-7.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_25_1-0:1-7.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_25_1-debuginfo-0:1-7.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_25_1-debuginfo-0:1-7.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_31_1-0:1-6.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_31_1-0:1-6.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_31_1-0:1-6.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_31_1-debuginfo-0:1-6.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_31_1-debuginfo-0:1-6.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_36_2-0:1-5.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_36_2-0:1-5.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_36_2-0:1-5.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_36_2-debuginfo-0:1-5.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_36_2-debuginfo-0:1-5.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_41_1-0:1-4.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_41_1-0:1-4.el7.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_41_1-0:1-4.el7.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • kpatch-patch-3_10_0-1160_41_1-debuginfo-0:1-4.el7.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • +21 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 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. 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. 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 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 (8)