RHSA-2024:1332 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

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):

• sched/membarrier: reduce the ability to hammer on sys_membarrier (CVE-2024-26602)
• use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c (CVE-2022-42896)
• use-after-free in sch_qfq network scheduler (CVE-2023-4921)
• IGB driver inadequate buffer size for frames larger than MTU (CVE-2023-45871)
• fbcon: out-of-sync arrays in fbcon_mode_deleted due to wrong con2fb_map assignment (CVE-2023-38409)
• nf_tables: use-after-free vulnerability in the nft_verdict_init() function (CVE-2024-1086)

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 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64
• Red Hat Enterprise Linux for Real Time for x86_64 - Extended Life Cycle Support 7 x86_64

Fixes

• BZ - 2147364 - CVE-2022-42896 kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c
• BZ - 2230042 - CVE-2023-38409 kernel: fbcon: out-of-sync arrays in fbcon_mode_deleted due to wrong con2fb_map assignment
• 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
• BZ - 2262126 - CVE-2024-1086 kernel: nf_tables: use-after-free vulnerability in the nft_verdict_init() function
• BZ - 2267695 - CVE-2024-26602 kernel: sched/membarrier: reduce the ability to hammer on sys_membarrier

CVEs

• CVE-2022-42896
• CVE-2023-4921
• CVE-2023-38409
• CVE-2023-45871
• CVE-2024-1086
• CVE-2024-26602

References

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