CVE-2025-37992

MediumCVSS 5.5/10Last modified Nov 5, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < ea1132ccb112f51ba749c56a912f67970c2cd542; >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < d3336f746f196c6a53e0480923ae93939f047b6c; >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < d38939ebe0d992d581acb6885c1723fa83c1fb2c; >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < a7d6e0ac0a8861f6b1027488062251a8e28150fd; >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < d1365ca80b012d8a7863e45949e413fb61fa4861; >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76; >= 76e3cc126bb223013a6b9a0e2a51238d1ef2e409, < 2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
LinuxLinux3.5

References

Timeline

Published
May 26, 2025
Last modified
Nov 5, 2026
NVD status
Analyzed

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CVE-2025-37992: Medium severity, CVSS 5.5 | Vulnix