Answer in brief
CVE-2025-21909 records a Medium severity (CVSS 5.5) vulnerability in wifi: nl80211: reject cooked mode if it is set along with other flags. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <5ea856d93794c4afa5542defd8c61f2708dc245a || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7 || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <cd1bdcb77fdc03c253137e55bae10551b3481461 || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <236f41ca728f23210b31ed2d1d8a6df575a4b2d6 || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <ebebbb0eded2ed9a1abfa31962f6fb699e6abce7 || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <521e55c2b0d6028861ac0a2d06aa57bb0e3ac486 || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <ac4860141300581d3e2f6c6dafa37220f7ea9f65 || >=66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a <49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f | 5ea856d93794c4afa5542defd8c61f2708dc245a, 351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7, cd1bdcb77fdc03c253137e55bae10551b3481461, 236f41ca728f23210b31ed2d1d8a6df575a4b2d6, ebebbb0eded2ed9a1abfa31962f6fb699e6abce7, 521e55c2b0d6028861ac0a2d06aa57bb0e3ac486, ac4860141300581d3e2f6c6dafa37220f7ea9f65, 49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f |
| Linux/Linuxgeneric | 2.6.26 | Not reported |
Published upstream
Apr 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.