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: stack overflow in do_proc_dointvec and proc_skip_spaces (CVE-2022-4378)
• ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF (CVE-2023-0266)
• kernel: FUSE filesystem low-privileged user privileges escalation (CVE-2023-0386)
• kpatch: mm/mremap.c: incomplete fix for CVE-2022-41222 (CVE-2023-1476)

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 - 2152548 - CVE-2022-4378 kernel: stack overflow in do_proc_dointvec and proc_skip_spaces
• BZ - 2159505 - CVE-2023-0386 kernel: FUSE filesystem low-privileged user privileges escalation
• BZ - 2163379 - CVE-2023-0266 ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF
• BZ - 2176035 - CVE-2023-1476 kpatch: mm/mremap.c: incomplete fix for CVE-2022-41222

CVEs

• CVE-2022-4378
• CVE-2023-0266
• CVE-2023-0386
• CVE-2023-1476

References

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