PoC Index85,092 CVEs with PoCs

CVE-2023-4921

Use-after-free in Linux kernel's net/sched: sch_qfq component

HIGH 7.8EPSS 0.4%

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.

Affected
Linux · Kernel
CVSS v3.1 NVD
7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
0.42% chance of exploitation in the next 30 days, 35th percentile
Published
2023-09-12
Updated
2026-10-14

Exploit collections (1)

Security advisories

References