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CVE-2025-21909

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: reject cooked mode if it is set along with other flags It is possible to set both MONITOR_FLAG_COOK_FRAMES and M…

Published Apr 1, 2025CWE-362EPSS 0.17%

Overview

CVE-2025-21909 is a medium-severity vulnerability. It was published on April 1, 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:

wifi: nl80211: reject cooked mode if it is set along with other flags

It is possible to set both MONITOR_FLAG_COOK_FRAMES and MONITOR_FLAG_ACTIVE

flags simultaneously on the same monitor interface from the userspace. This

causes a sub-interface to be created with no IEEE80211_SDATA_IN_DRIVER bit

set because the monitor interface is in the cooked state and it takes

precedence over all other states. When the interface is then being deleted

the kernel calls WARN_ONCE() from check_sdata_in_driver() because of missing

that bit.

Fix this by rejecting MONITOR_FLAG_COOK_FRAMES if it is set along with

other flags.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

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/236f41ca728f23210b31ed2d1d8a6df575a4b2d6Refgit.kernel.org/stable/c/351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7Refgit.kernel.org/stable/c/49f27f29446a5bfe633dd2cc0cfebd48a1a5e77fRefgit.kernel.org/stable/c/521e55c2b0d6028861ac0a2d06aa57bb0e3ac486Refgit.kernel.org/stable/c/5ea856d93794c4afa5542defd8c61f2708dc245aRefgit.kernel.org/stable/c/ac4860141300581d3e2f6c6dafa37220f7ea9f65Refgit.kernel.org/stable/c/cd1bdcb77fdc03c253137e55bae10551b3481461Refgit.kernel.org/stable/c/ebebbb0eded2ed9a1abfa31962f6fb699e6abce7Reflists.debian.org/debian-lts-announce/2025/05/msg00030.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00045.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21909?

CVE-2025-21909 is a medium-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21909?

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-2025-21909?

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-2025-21909?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21909 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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