CVE-2025-40131

Kernel warning via stale monitor-mode peer identifier

Published Nov 12, 2025 · Updated May 23, 2026

Improper peer lookup in affected Linux kernels allows attackers to trigger a mac80211 warning through ath12k monitor-mode traffic. In ath12k_dp_mon_rx_deliver_msdu(), monitor-mode frames bypass the descriptor path that sets rxcb->peer_id, so a NULL peer leaves link_id and link_valid unset in RX status. The trigger requires an associated station and ath12k monitor mode; the public record documents a WARN_ON but no crash or service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper peer lookup in affected Linux kernels allows attackers to trigger a mac80211 warning through ath12k monitor-mode traffic. In ath12k_dp_mon_rx_deliver_msdu(), monitor-mode frames bypass the descriptor path that sets rxcb->peer_id, so a NULL peer leaves link_id and link_valid unset in RX status. The trigger requires an associated station and ath12k monitor mode; the public record documents a WARN_ON but no crash or service interruption.

The record

CVE
CVE-2025-40131
Published
Nov 12, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=124bd8cea02395a1a140f1dcc5e57c65cdd428af
  2. Affected versionversion=6.15.3 <6.16
  3. Affected versionversion=6.16
  4. Affected versionversion=bd00cc7e8a4c1048d14c9a9e9790c582119785fb <7ca61ed8b3f3fc9a7decd68039cb1d7d1238c566
  5. Affected versionversion=bd00cc7e8a4c1048d14c9a9e9790c582119785fb <da64eb2da76ce5626238a951fdf3e81810454427

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=124bd8cea02395a1a140f1dcc5e57c65cdd428af; version=6.15.3 <6.16; version=6.16; version=bd00cc7e8a4c1048d14c9a9e9790c582119785fb <7ca61ed8b3f3fc9a7decd68039cb1d7d1238c566; version=bd00cc7e8a4c1048d14c9a9e9790c582119785fb <da64eb2da76ce5626238a951fdf3e81810454427

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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