NetSight
IP …
high7.8

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.

Impact

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 products

VendorProductAffected versions
LinuxLinux Kernel
from 3.8 before 4.14.326
from 4.15 before 4.19.295
from 4.20 before 5.4.257
from 5.5 before 5.10.195
from 5.11 before 5.15.132
from 5.16 before 6.1.54
DebianDebian Linux
Version 10.0

Weakness classification

CWE-416

References