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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/236f41ca728f23210b31ed2d1d8a6df575a4b2d6 cve-icon cve-icon
https://git.kernel.org/stable/c/351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7 cve-icon cve-icon
https://git.kernel.org/stable/c/49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f cve-icon cve-icon
https://git.kernel.org/stable/c/521e55c2b0d6028861ac0a2d06aa57bb0e3ac486 cve-icon cve-icon
https://git.kernel.org/stable/c/5ea856d93794c4afa5542defd8c61f2708dc245a cve-icon cve-icon
https://git.kernel.org/stable/c/ac4860141300581d3e2f6c6dafa37220f7ea9f65 cve-icon cve-icon
https://git.kernel.org/stable/c/cd1bdcb77fdc03c253137e55bae10551b3481461 cve-icon cve-icon
https://git.kernel.org/stable/c/ebebbb0eded2ed9a1abfa31962f6fb699e6abce7 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025040129-CVE-2025-21909-90df@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-21909 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-21909 cve-icon
History

Fri, 23 May 2025 02:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 2.8, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L'}

Wed, 02 Apr 2025 14:00:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Tue, 01 Apr 2025 16:00:00 +0000

Type Values Removed Values Added
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.
Title wifi: nl80211: reject cooked mode if it is set along with other flags
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-04-01T15:40:48.680Z

Updated: 2025-05-04T07:24:10.345Z

Reserved: 2024-12-29T08:45:45.786Z

Link: CVE-2025-21909

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-04-01T16:15:21.430

Modified: 2025-04-01T20:26:01.990

Link: CVE-2025-21909

cve-icon Redhat

Severity : Low

Publid Date: 2025-04-01T00:00:00Z

Links: CVE-2025-21909 - Bugzilla