Use After Free Affecting kernel-debug package, versions <0:4.18.0-193.128.1.el8_2
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUG-6429988
- published 13 Mar 2024
- disclosed 5 Sep 2023
Introduced: 5 Sep 2023
CVE-2023-4921 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug to version 0:4.18.0-193.128.1.el8_2 or higher.
This issue was patched in RHSA-2024:1268.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.
When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue().
We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.
References
- https://access.redhat.com/security/cve/CVE-2023-4921
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8
- https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html