CVEvulnerability

CVE-2025-21703

7.8 HIGH Published 2025-02-18 Modified 2026-10-15 Official page ↗
Status
Modified
Published
2025-02-18
Last modified
2026-10-15
Assigner
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
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 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
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

In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.

Affected configurations

• linux linux kernel (>= 5.4.288 < 5.4.291) • linux linux kernel (>= 5.10.232 < 5.10.235) • linux linux kernel (>= 5.15.175 < 5.15.179) • linux linux kernel (>= 6.1.121 < 6.1.129) • linux linux kernel (>= 6.6.67 < 6.6.78) • linux linux kernel (>= 6.12.6 < 6.12.14) • linux linux kernel (>= 6.13 < 6.13.3) • linux linux kernel 6.14

Related

Weakness · CWE (1)

References