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CVE-2025-39689

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrac…

Published Sep 5, 2025CWE-416EPSS 0.18%

Overview

CVE-2025-39689 is a high-severity vulnerability. It was published on September 5, 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:

ftrace: Also allocate and copy hash for reading of filter files

Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds

the pointer to the global tracer hash to its iterator. Unlike the writer

that allocates a copy of the hash, the reader keeps the pointer to the

filter hashes. This is problematic because this pointer is static across

function calls that release the locks that can update the global tracer

hashes. This can cause UAF and similar bugs.

Allocate and copy the hash for reading the filter files like it is done

for the writers. This not only fixes UAF bugs, but also makes the code a

bit simpler as it doesn't have to differentiate when to free the

iterator's hash between writers and readers.

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/12064e1880fc9202be75ff668205b1703d92f74fRefgit.kernel.org/stable/c/3b114a3282ab1a12cb4618a8f45db5d7185e784aRefgit.kernel.org/stable/c/64db338140d2bad99a0a8c6a118dd60b3e1fb8cbRefgit.kernel.org/stable/c/a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309Refgit.kernel.org/stable/c/bfb336cf97df7b37b2b2edec0f69773e06d11955Refgit.kernel.org/stable/c/c4cd93811e038d19f961985735ef7bb128078dfbRefgit.kernel.org/stable/c/c591ba1acd081d4980713e47869dd1cc3d963d19Refgit.kernel.org/stable/c/e0b6b223167e1edde5c82edf38e393c06eda1f13Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39689?

CVE-2025-39689 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39689?

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-2025-39689?

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-2025-39689?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39689 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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