CVE-2025-21909
Full vulnerability record from the local CVENow database.
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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-04-01 16:15:21.430000
Last modified
2026-11-05 21:17:45.783000
View original CVE JSON
{
"id": "CVE-2025-21909",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-04-01T16:15:21.430",
"lastModified": "2026-11-05T21:17:45.783",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: nl80211: reject cooked mode if it is set along with other flags\n\nIt is possible to set both MONITOR_FLAG_COOK_FRAMES and MONITOR_FLAG_ACTIVE\nflags simultaneously on the same monitor interface from the userspace. This\ncauses a sub-interface to be created with no IEEE80211_SDATA_IN_DRIVER bit\nset because the monitor interface is in the cooked state and it takes\nprecedence over all other states. When the interface is then being deleted\nthe kernel calls WARN_ONCE() from check_sdata_in_driver() because of missing\nthat bit.\n\nFix this by rejecting MONITOR_FLAG_COOK_FRAMES if it is set along with\nother flags.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: nl80211: rechaza el modo cocinado si se configura junto con otras banderas. Es posible configurar simultáneamente las banderas MONITOR_FLAG_COOK_FRAMES y MONITOR_FLAG_ACTIVE en la misma interfaz de monitor desde el espacio de usuario. Esto provoca que se cree una subinterfaz sin el bit IEEE80211_SDATA_IN_DRIVER configurado, ya que la interfaz de monitor está en estado cocinado y tiene prioridad sobre todos los demás estados. Al eliminar la interfaz, el kernel llama a WARN_ONCE() desde check_sdata_in_driver() debido a la falta de ese bit. Solucione esto rechazando MONITOR_FLAG_COOK_FRAMES si se configura junto con otras banderas. Encontrado por el Centro de Verificación de Linux (linuxtesting.org) con Syzkaller."
}
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"source": "[email protected]",
"type": "Primary",
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"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
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"id": "CVE-2025-21909",
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"description": [
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