Important: kernel security, bug fix, and enhancement update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.

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):

• 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)

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):

• RHEL 8.7: please integrate "powerpc/64/kdump: Limit kdump base to 512MB" patch. (BZ#2154272)
• Redhat OpenShift: Error downloading big ZIP files inside pod on power OCP and pod getting restarted (BZ#2160222)
• RHEL8.4: s390/kexec: fix ipl report address for kdump (BZ#2166297)
• Unable to get QinQ working with ConnectX-4 Lx in SR-IOV scenario (BZ#2166666)
• mlx5: lag and sriov fixes (BZ#2167648)
• New algorithm limits needed in FIPS mode (BZ#2167771)
• RHEL8.4: dasd: fix no record found for raw_track_access (BZ#2167777)
• kernel panics if iwlwifi firmware can not be loaded (BZ#2169664)
• CSB.V bit never becomes valid for NX Gzip job during LPAR migration (BZ#2170855)
• Backport Request for locking/rwsem commits (BZ#2170940)
• ipv6 traffic stop when an sriov vf have ipv6 address (BZ#2172551)
• Hyper-V RHEL8.8: Update MANA driver (BZ#2173104)
• Disable 3DES in FIPS mode (BZ#2176523)
• Soft lockup occurred during __page_mapcount (BZ#2177139)
• Task hangs in blk_mq_get_tag while no tags are in use (BZ#2178225)
• Node locked up and not responsive due to potential rcu stall (BZ#2178273)

Enhancement(s):

• Intel 8.8 FEAT SPR CPU: AMX: Improve the init_fpstate setup code (BZ#2168385)

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 - Extended Update Support 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.6 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat Virtualization Host 4 for RHEL 8 x86_64
• Red Hat Enterprise Linux Server - TUS 8.6 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.6 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.6 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.6 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.6 aarch64

Fixes

• 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

CVEs

• CVE-2023-0266
• CVE-2023-0386

References

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