RHSA-2024:0431 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: net/sched: sch_hfsc UAF (CVE-2023-4623)
• kernel: use after free in nvmet_tcp_free_crypto in NVMe (CVE-2023-5178)
• kernel: IGB driver inadequate buffer size for frames larger than MTU (CVE-2023-45871)
• kernel: xfrm_expand_policies() in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice (CVE-2022-36879)
• kernel: null-ptr-deref vulnerabilities in sl_tx_timeout in drivers/net/slip (CVE-2022-41858)
• kernel: use-after-free caused by invalid pointer hostname in fs/cifs/connect.c (CVE-2023-1195)
• kernel: UAF during login when accessing the shost ipaddress (CVE-2023-2162)
• kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race (CVE-2023-3567)
• kernel: use-after-free in netfilter: nf_tables (CVE-2023-3777)
• kernel: SEV-ES local priv escalation (CVE-2023-46813)

Bug Fix(es):

• kernel-rt: update RT source tree to the latest RHEL-9.0.z Batch 14 (RHEL-17273)

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

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

Affected Products

• Red Hat Enterprise Linux for Real Time for x86_64 - 4 years of updates 9.0 x86_64
• Red Hat Enterprise Linux for Real Time for NFV for x86_64 - 4 years of updates 9.0 x86_64

Fixes

• BZ - 2119855 - CVE-2022-36879 kernel: xfrm_expand_policies() in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice
• BZ - 2144379 - CVE-2022-41858 kernel: null-ptr-deref vulnerabilities in sl_tx_timeout in drivers/net/slip
• BZ - 2154171 - CVE-2023-1195 kernel: use-after-free caused by invalid pointer hostname in fs/cifs/connect.c
• BZ - 2187773 - CVE-2023-2162 kernel: UAF during login when accessing the shost ipaddress
• BZ - 2221463 - CVE-2023-3567 kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race
• BZ - 2237750 - CVE-2023-3777 kernel: use-after-free in netfilter: nf_tables
• BZ - 2237757 - CVE-2023-4623 kernel: net/sched: sch_hfsc UAF
• BZ - 2241924 - CVE-2023-5178 kernel: use after free in nvmet_tcp_free_crypto in NVMe
• BZ - 2244723 - CVE-2023-45871 kernel: IGB driver inadequate buffer size for frames larger than MTU
• BZ - 2246944 - CVE-2023-46813 kernel: SEV-ES local priv escalation

CVEs

• CVE-2022-36879
• CVE-2022-41858
• CVE-2023-1195
• CVE-2023-2162
• CVE-2023-3567
• CVE-2023-3777
• CVE-2023-4623
• CVE-2023-5178
• CVE-2023-45871
• CVE-2023-46813

References

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