What is CVE-2023-4921?

CVE-2023-4921 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-09-12.

How severe is CVE-2023-4921?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Linux Kernel

CVE-2023-4921

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-…

Vulnerability class: Use-After-Free

EPSS: 0.000 (2.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux Kernel — versions 3.8

Weakness classification (CWE)

CWE-416 — Use After Free

References

git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (patch)
kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8
lists.debian.org/debian-lts-announce/2023/10/msg00027.html
lists.debian.org/debian-lts-announce/2024/01/msg00004.html

Frequently asked questions

What is CVE-2023-4921?: CVE-2023-4921 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-09-12.
How severe is CVE-2023-4921?: High severity. CVSS v3 base score is 7.8 out of 10.