Important: kernel security and bug fix update

Topic

An update for kernel 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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• Kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route (CVE-2023-4128)
• kernel: nf_tables: use-after-free in nft_chain_lookup_byid() (CVE-2023-31248)
• kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval() (CVE-2023-35001)
• kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt() (CVE-2023-35788)
• kernel: hash collisions in the IPv6 connection lookup table (CVE-2023-1206)
• kernel: Spectre v2 SMT mitigations problem (CVE-2023-1998)
• kernel: fbcon: shift-out-of-bounds in fbcon_set_font() (CVE-2023-3161)
• kernel: denial of service problem in net/unix/diag.c (CVE-2023-28327)

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):

• Rhel9.2 - drmgr command is failing [hvcs/PowerVS] (BZ#2213790)
• Wrong hwlat CPU affinity when started from a container. (BZ#2221158)
• cifs: check the lease context if we actually got a lease (BZ#2221160)
• [Hyper-V][RHEL 9]incomplete fc_transport implementation in storvsc causes null dereference in fc_timed_out() (BZ#2230748)
• RHEL-9: WARNING: bad unlock balance detected! (BZ#2232214)
• core: backports from upstream (BZ#2238028)

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 9.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.0 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 9.0 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 9.0 ppc64le
• Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 9.0 s390x
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 9.0 aarch64
• Red Hat Enterprise Linux Server for ARM 64 - 4 years of updates 9.0 aarch64
• Red Hat Enterprise Linux Server for IBM z Systems - 4 years of updates 9.0 s390x

Fixes

• BZ - 2175903 - CVE-2023-1206 kernel: hash collisions in the IPv6 connection lookup table
• BZ - 2177382 - CVE-2023-28327 kernel: denial of service problem in net/unix/diag.c
• BZ - 2187257 - CVE-2023-1998 kernel: Spectre v2 SMT mitigations problem
• BZ - 2213485 - CVE-2023-3161 kernel: fbcon: shift-out-of-bounds in fbcon_set_font()
• BZ - 2215768 - CVE-2023-35788 kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()
• BZ - 2220892 - CVE-2023-35001 kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval()
• BZ - 2220893 - CVE-2023-31248 kernel: nf_tables: use-after-free in nft_chain_lookup_byid()
• BZ - 2225511 - CVE-2023-4128 kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route

CVEs

• CVE-2023-1206
• CVE-2023-1998
• CVE-2023-3161
• CVE-2023-4128
• CVE-2023-28327
• CVE-2023-31248
• CVE-2023-35001
• CVE-2023-35788

References

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