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CVE-2025-37915

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net_sched: drr: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use case…

Published May 20, 2025CWE-415EPSS 0.22%

Overview

CVE-2025-37915 is a high-severity vulnerability. It was published on May 20, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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: drr: Fix double list add in class with netem as child qdisc

As described in Gerrard's report [1], there are use cases where a netem

child qdisc will make the parent qdisc's enqueue callback reentrant.

In the case of drr, there won't be a UAF, but the code will add the same

classifier to the list twice, which will cause memory corruption.

In addition to checking for qlen being zero, this patch checks whether the

class was already added to the active_list (cl_is_active) before adding

to the list to cover for the reentrant case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

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/26e75716b94d6ff9be5ea07d63675c4d189f30b4Refgit.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3Refgit.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100dRefgit.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcfRefgit.kernel.org/stable/c/5da3aad1a13e7edb8ff0778a444ccf49930313e9Refgit.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1Refgit.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3ebRefgit.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9aReflists.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-2025-37915?

CVE-2025-37915 is a high-severity vulnerability. It was published on May 20, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-37915?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-37915?

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-2025-37915?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37915 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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