CVE-2025-39732

Kernel availability loss via atomic-context sleep

Published Sep 7, 2025 · Updated Aug 5, 2026

Improper locking in the Linux kernel ath11k driver allows local users to trigger an availability failure during bitrate-mask handling. The ath11k_mac_disable_peer_fixed_rate() callback can sleep while ieee80211_iterate_stations_atomic() invokes it in atomic context. Reachability requires local access and an active ath11k device; the reported consequence is a kernel warning and availability loss, not data access or code execution.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel ath11k driver allows local users to trigger an availability failure during bitrate-mask handling. The ath11k_mac_disable_peer_fixed_rate() callback can sleep while ieee80211_iterate_stations_atomic() invokes it in atomic context. Reachability requires local access and an active ath11k device; the reported consequence is a kernel warning and availability loss, not data access or code execution.

The record

CVE
CVE-2025-39732
Published
Sep 7, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.6
  2. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <65c12b104cb942d588a1a093acc4537fb3d3b129
  3. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <6bdef22d540258ca06f079f7b6ae100669a19b47
  4. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <7d4d0db0dc9424de2bdc0b45e919e4892603356f
  5. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <9c0e3144924c7db701575a73af341d33184afeaf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=d5c65159f2895379e11ca13f62feabe93278985d <65c12b104cb942d588a1a093acc4537fb3d3b129; version=d5c65159f2895379e11ca13f62feabe93278985d <6bdef22d540258ca06f079f7b6ae100669a19b47; version=d5c65159f2895379e11ca13f62feabe93278985d <7d4d0db0dc9424de2bdc0b45e919e4892603356f; version=d5c65159f2895379e11ca13f62feabe93278985d <9c0e3144924c7db701575a73af341d33184afeaf

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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