Important: kernel security, bug fix, and enhancement update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.

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

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: tun: avoid double free in tun_free_netdev (CVE-2022-4744)
• ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF (CVE-2023-0266)
• kernel: net: CPU soft lockup in TC mirred egress-to-ingress action (CVE-2022-4269)

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):

• RHEL9.0 - zfcp: fix missing auto port scan and thus missing target ports (BZ#2127880)
• Cgroups_v2, when creating new cgroup/container, resets the cpu affinity masks for all usr processes on the system. (BZ#2143766)
• RHEL9.0 - boot: Add secure boot trailer (BZ#2151528)
• kernel-rt-debug: WARNING: possible circular locking dependency detected (&n->list_lock->&p->pi_lock->&lock->wait_lock) (BZ#2160614)
• Support cpuset.sched_load_balance by changing default CPUset directory structure (BZ#2161105)
• RHEL9.0 - s390/kexec: fix ipl report address for kdump (BZ#2166903)
• libgpiod doesn't seem to work with Interphase gpiochip (BZ#2166956)
• Azure RHEL9 scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM (BZ#2170227)

Enhancement(s):

• IBM 9.2 FEAT: Upgrade the QETH driver to latest from upstream, e.g. kernel 6.0 (BZ#2166304)
• Intel 9.2 FEAT SPR CPU: AMX: Improve the init_fpstate setup code (BZ#2168382)

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

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for x86_64 9 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 9 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 9 s390x

Fixes

• BZ - 2150272 - CVE-2022-4269 kernel: net: CPU soft lockup in TC mirred egress-to-ingress action
• BZ - 2156322 - CVE-2022-4744 kernel: tun: avoid double free in tun_free_netdev
• BZ - 2163379 - CVE-2023-0266 ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF

CVEs

• CVE-2022-4269
• CVE-2022-4744
• CVE-2023-0266

References

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