CVE-2025-21909

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.

The following products are affected by CVE-2025-21909 vulnerability.

No data.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-21909.

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