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CVE-2025-37992

5.5 · MEDIUM

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, onl…

Published May 26, 2025CWE-476EPSS 0.21%

Overview

CVE-2025-37992 is a medium-severity vulnerability. It was published on May 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8Refgit.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fdRefgit.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861Refgit.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6cRefgit.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2cRefgit.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542Refgit.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76Reflists.debian.org/debian-lts-announce/2025/08/msg00010.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00007.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37992?

CVE-2025-37992 is a medium-severity vulnerability. It was published on May 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-37992?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-37992?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-37992?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37992 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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