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CVE-2025-37879

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the serve…

Published May 9, 2025CWE-125EPSS 0.72%

Overview

CVE-2025-37879 is a critical-severity vulnerability. It was published on May 9, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

9p/net: fix improper handling of bogus negative read/write replies

In p9_client_write() and p9_client_read_once(), if the server

incorrectly replies with success but a negative write/read count then we

would consider written (negative) <= rsize (positive) because both

variables were signed.

Make variables unsigned to avoid this problem.

The reproducer linked below now fails with the following error instead

of a null pointer deref:

9pnet: bogus RWRITE count (4294967295 > 3)

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/374e4cd75617c8c2552f562f39dd989583f5c330Refgit.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12bRefgit.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5Refgit.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034Refgit.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73bReflists.debian.org/debian-lts-announce/2025/05/msg00045.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37879?

CVE-2025-37879 is a critical-severity vulnerability. It was published on May 9, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-37879?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-37879?

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-2025-37879?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37879 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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