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CVE-2025-38637

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net_sched: skbprio: Remove overly strict queue assertions In the current implementation, skbprio enqueue/dequeue contains an as…

Published Apr 18, 2025CWE-617EPSS 0.33%

Overview

CVE-2025-38637 is a medium-severity vulnerability. It was published on April 18, 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: skbprio: Remove overly strict queue assertions

In the current implementation, skbprio enqueue/dequeue contains an assertion

that fails under certain conditions when SKBPRIO is used as a child qdisc under

TBF with specific parameters. The failure occurs because TBF sometimes peeks at

packets in the child qdisc without actually dequeuing them when tokens are

unavailable.

This peek operation creates a discrepancy between the parent and child qdisc

queue length counters. When TBF later receives a high-priority packet,

SKBPRIO's queue length may show a different value than what's reflected in its

internal priority queue tracking, triggering the assertion.

The fix removes this overly strict assertions in SKBPRIO, they are not

necessary at all.

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/034b293bf17c124fec0f0e663f81203b00aa7a50Refgit.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8Refgit.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85Refgit.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380Refgit.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98caRefgit.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919Refgit.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160eRefgit.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bcRefgit.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8Reflists.debian.org/debian-lts-announce/2025/05/msg00030.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38637?

CVE-2025-38637 is a medium-severity vulnerability. It was published on April 18, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38637?

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-2025-38637?

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-2025-38637?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38637 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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