CVEvulnerability

CVE-2023-4921

7.8 HIGH Published 2023-09-12 Modified 2026-10-14 Official page ↗
Status
Modified
Published
2023-09-12
Last modified
2026-10-14
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-416

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.

Affected configurations

• linux linux kernel (>= 3.8 < 4.14.326) • linux linux kernel (>= 4.15 < 4.19.295) • linux linux kernel (>= 4.20 < 5.4.257) • linux linux kernel (>= 5.5 < 5.10.195) • linux linux kernel (>= 5.11 < 5.15.132) • linux linux kernel (>= 5.16 < 6.1.54) • linux linux kernel (>= 6.2 < 6.5.4) • debian debian linux 10.0

Related

Weakness · CWE (1)

References