Detections
Analytics
CVE-2023-4921
high
Description
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://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8