Important: kpatch-patch security update

Topic

An update for kpatch-patch 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.

Description

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 unix_gc() which could result in a local privilege escalation (CVE-2021-0920)
• kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout (CVE-2021-4154)
• kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)
• kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS (CVE-2022-0435)
• kernel: cgroups v1 release_agent feature may allow privilege escalation (CVE-2022-0492)
• 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.

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

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le

Fixes

• BZ - 2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation
• BZ - 2034514 - CVE-2021-4154 kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout
• BZ - 2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB flush
• BZ - 2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation
• BZ - 2048738 - CVE-2022-0435 kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS
• BZ - 2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation

CVEs

• CVE-2021-0920
• CVE-2021-4154
• CVE-2022-0330
• CVE-2022-0435
• CVE-2022-0492
• CVE-2022-22942

References

• https://access.redhat.com/security/updates/classification/#important