The following advisory data is extracted from:

https://access.redhat.com/security/data/csaf/v2/advisories/2024/rhsa-2024_2585.json

Red Hat officially shut down their mailing list notifications October 10, 2023. Due to this, Packet Storm has recreated the below data as a reference point to raise awareness. It must be noted that due to an inability to easily track revision updates without crawling Red Hat's archive, these advisories are single notifications and we strongly suggest that you visit the Red Hat provided links to ensure you have the latest information available if the subject matter listed pertains to your environment.

- Packet Storm Staff

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Red Hat Security Advisory

Synopsis: Moderate: kernel-rt security and bug fix update
Advisory ID: RHSA-2024:2585-03
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2024:2585
Issue date: 2024-04-30
Revision: 03
CVE Names: CVE-2021-46915
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Summary:

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:

https://access.redhat.com/articles/11258

CVEs:

CVE-2021-46915

References:

https://access.redhat.com/security/updates/classification/#moderate
https://bugzilla.redhat.com/show_bug.cgi?id=2231800
https://bugzilla.redhat.com/show_bug.cgi?id=2265645
https://bugzilla.redhat.com/show_bug.cgi?id=2266423
https://bugzilla.redhat.com/show_bug.cgi?id=2267695