RHSA-2024:0563 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions.

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: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe (CVE-2023-2163)
• kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags (CVE-2023-3812)
• kernel: use after free in unix_stream_sendpage (CVE-2023-4622)
• kernel: net/sched: sch_hfsc UAF (CVE-2023-4623)
• kernel: use-after-free in sch_qfq network scheduler (CVE-2023-4921)
• kernel: netfilter: potential slab-out-of-bound access due to integer underflow (CVE-2023-42753)
• kernel: IGB driver inadequate buffer size for frames larger than MTU (CVE-2023-45871)
• hw: Intel: Gather Data Sampling (GDS) side channel vulnerability (CVE-2022-40982)
• kernel: UAF during login when accessing the shost ipaddress (CVE-2023-2162)
• kernel: fbcon: out-of-sync arrays in fbcon_mode_deleted due to wrong con2fb_map assignment (CVE-2023-38409)
• kernel: use-after-free in smb2_is_status_io_timeout() (CVE-2023-1192)

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 - Telecommunications Update Service 8.4 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.4 x86_64

Fixes

• BZ - 2154178 - CVE-2023-1192 kernel: use-after-free in smb2_is_status_io_timeout()
• BZ - 2187773 - CVE-2023-2162 kernel: UAF during login when accessing the shost ipaddress
• BZ - 2223949 - CVE-2022-40982 hw: Intel: Gather Data Sampling (GDS) side channel vulnerability
• BZ - 2224048 - CVE-2023-3812 kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags
• BZ - 2230042 - CVE-2023-38409 kernel: fbcon: out-of-sync arrays in fbcon_mode_deleted due to wrong con2fb_map assignment
• BZ - 2237757 - CVE-2023-4623 kernel: net/sched: sch_hfsc UAF
• BZ - 2237760 - CVE-2023-4622 kernel: use after free in unix_stream_sendpage
• BZ - 2239843 - CVE-2023-42753 kernel: netfilter: potential slab-out-of-bound access due to integer underflow
• BZ - 2240249 - CVE-2023-2163 kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe
• BZ - 2244723 - CVE-2023-45871 kernel: IGB driver inadequate buffer size for frames larger than MTU
• BZ - 2245514 - CVE-2023-4921 kernel: use-after-free in sch_qfq network scheduler

CVEs

• CVE-2022-40982
• CVE-2023-1192
• CVE-2023-2162
• CVE-2023-2163
• CVE-2023-3812
• CVE-2023-4622
• CVE-2023-4623
• CVE-2023-4921
• CVE-2023-38409
• CVE-2023-42753
• CVE-2023-45871

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/solutions/7027704