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CVE-2025-39864

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: fix use-after-free in cmp_bss() Following bss_free() quirk introduced in commit 776b3580178f ("cfg80211: track…

Published Sep 19, 2025CWE-416EPSS 0.24%

Overview

CVE-2025-39864 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

wifi: cfg80211: fix use-after-free in cmp_bss()

Following bss_free() quirk introduced in commit 776b3580178f

("cfg80211: track hidden SSID networks properly"), adjust

cfg80211_update_known_bss() to free the last beacon frame

elements only if they're not shared via the corresponding

'hidden_beacon_bss' pointer.

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/26e84445f02ce6b2fe5f3e0e28ff7add77f35e08Refgit.kernel.org/stable/c/5b7ae04969f822283a95c866967e42b4d75e0eefRefgit.kernel.org/stable/c/6854476d9e1aeaaf05ebc98d610061c2075db07dRefgit.kernel.org/stable/c/912c4b66bef713a20775cfbf3b5e9bd71525c716Refgit.kernel.org/stable/c/a8bb681e879ca3c9f722aa08d3d7ae41c42a8807Refgit.kernel.org/stable/c/a97a9791e455bb0cd5e7a38b5abcb05523d4e21cRefgit.kernel.org/stable/c/b7d08929178c16398278613df07ad65cf63cce9dRefgit.kernel.org/stable/c/ff040562c10a540b8d851f7f4145fa112977f853Reflists.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-2025-39864?

CVE-2025-39864 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-39864?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-39864?

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-2025-39864?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39864 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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