RHSA-2024:2585 - 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 Moderate. 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: use-after-free in l2cap_sock_release in net/bluetooth/l2cap_sock.c (CVE-2023-40283)
• kernel: mlxsw: spectrum_acl_tcam: Fix stack corruption (CVE-2024-26586)
• kernel: netfilter: divide error in nft_limit_init (CVE-2021-46915)
• kernel: sched/membarrier: reduce the ability to hammer on sys_membarrier (CVE-2024-26602)

Bug Fix(es):

• kernel-rt: kernel: use-after-free in l2cap_sock_release in net/bluetooth/l2cap_sock.c (JIRA:RHEL-20498)
• TRIAGE CVE-2021-46915 kernel-rt: kernel: netfilter: divide error in nft_limit_init (JIRA:RHEL-29264)
• kernel-rt: update RT source tree to the latest RHEL-8.4.z Batch 24 (JIRA:RHEL-29266)
• kernel-rt: kernel: sched/membarrier: reduce the ability to hammer on sys_membarrier (JIRA:RHEL-26391)
• kernel-rt: kernel: mlxsw: spectrum_acl_tcam: Fix stack corruption (JIRA:RHEL-29217)

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 - 2231800 - CVE-2023-40283 kernel: use-after-free in l2cap_sock_release in net/bluetooth/l2cap_sock.c
• BZ - 2265645 - CVE-2024-26586 kernel: mlxsw: spectrum_acl_tcam: Fix stack corruption
• BZ - 2266423 - CVE-2021-46915 kernel: netfilter: divide error in nft_limit_init
• BZ - 2267695 - CVE-2024-26602 kernel: sched/membarrier: reduce the ability to hammer on sys_membarrier

CVEs

• CVE-2021-46915
• CVE-2023-40283
• CVE-2024-26586
• CVE-2024-26602

References

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