Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2025-21909: wifi: nl80211: reject cooked mode if it is set along with other flags

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 236f41ca728f23210b31ed2d1d8a6df575a4b2d6, 351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7, 49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f.

Low priority for now. Upgrade to Linux Linux 236f41ca728f23210b31ed2d1d8a6df575a4b2d6, 351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7, 49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 1, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 7th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-21909

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.26 and later · before 5.4.291
  • linux linux kernel5.5 and later · before 5.10.235
  • linux linux kernel5.11 and later · before 5.15.179
  • linux linux kernel5.16 and later · before 6.1.131
  • linux linux kernel6.2 and later · before 6.6.83
  • linux linux kernel6.7 and later · before 6.12.19
  • linux linux kernel6.13 and later · before 6.13.7
  • linux linux kernel6.14

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.26affected
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before 5ea856d93794c4afa5542defd8c61f2708dc245aaffected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before 351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7affected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before cd1bdcb77fdc03c253137e55bae10551b3481461affected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before 236f41ca728f23210b31ed2d1d8a6df575a4b2d6affected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before ebebbb0eded2ed9a1abfa31962f6fb699e6abce7affected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before 521e55c2b0d6028861ac0a2d06aa57bb0e3ac486affected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before ac4860141300581d3e2f6c6dafa37220f7ea9f65affected · git
    • 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and later · before 49f27f29446a5bfe633dd2cc0cfebd48a1a5e77faffected · git
    • before 2.6.26not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.133-16.1.133-1
Debian:13linuxbefore 6.12.19-16.12.19-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-21907Apr 1, 2025 · mm: memory-failure: update ttu flag inside unmap_poisoned_folio
    22Monitor
  • ← EarlierCVE-2025-21908Apr 1, 2025 · NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback
    22Monitor
  • Later →CVE-2025-21910Apr 1, 2025 · wifi: cfg80211: regulatory: improve invalid hints checking
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux236f41ca728f23210b31ed2d1d8a6df575a4b2d6Vendor (CNA)
Linux Linux351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7Vendor (CNA)
Linux Linux49f27f29446a5bfe633dd2cc0cfebd48a1a5e77fVendor (CNA)
Linux Linux521e55c2b0d6028861ac0a2d06aa57bb0e3ac486Vendor (CNA)
Linux Linux5ea856d93794c4afa5542defd8c61f2708dc245aVendor (CNA)
Linux Linuxac4860141300581d3e2f6c6dafa37220f7ea9f65Vendor (CNA)
Linux Linuxcd1bdcb77fdc03c253137e55bae10551b3481461Vendor (CNA)
Linux Linuxebebbb0eded2ed9a1abfa31962f6fb699e6abce7Vendor (CNA)
debian:linux6.1.133-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records