CVE-2025-37992

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 36/100

Published: 2025-05-26 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: None

I: None

A: High

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: Flush gso_skb list too during ->change() Previously, when reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso_skb list. This could result in NULL pointer dereference when we only check sch->limit against sch->q.qlen. This patch introduces a new helper, qdisc_dequeue_internal(), which ensures both the gso_skb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie) are updated to use this helper in their ->change() routines.

Weakness Classification (1)

CWE-476

Affected Software (16)

Vendor	Product	Version
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < ea1132ccb112f51ba749c56a912f67970c2cd542
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d3336f746f196c6a53e0480923ae93939f047b6c
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d38939ebe0d992d581acb6885c1723fa83c1fb2c
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < a7d6e0ac0a8861f6b1027488062251a8e28150fd
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d1365ca80b012d8a7863e45949e413fb61fa4861
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76
Linux	Linux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < 2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
Linux	Linux	3.5
debian	debian_linux	11.0
linux	linux_kernel	3.5 – 5.10.238
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15