CVE-2025-39991

Service interruption via ath11k NULL dereference

Published Oct 15, 2025 · Updated Oct 15, 2025

NULL-pointer dereference in the Linux kernel ath11k Wi-Fi driver from 6.7 allows local users to interrupt service during M3 firmware loading. In ath11k_qmi_m3_load(), an M3-data path leaves fw null and then reads fw->size for error logging when M3 memory allocation fails. Reachability requires the ath11k M3 firmware-loading path, existing M3 data, and a failed M3 memory allocation; the documented impact is availability loss.

CVSS severity5.5
Medium
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

NULL-pointer dereference in the Linux kernel ath11k Wi-Fi driver from 6.7 allows local users to interrupt service during M3 firmware loading. In ath11k_qmi_m3_load(), an M3-data path leaves fw null and then reads fw->size for error logging when M3 memory allocation fails. Reachability requires the ath11k M3 firmware-loading path, existing M3 data, and a failed M3 memory allocation; the documented impact is availability loss.

The record

CVE
CVE-2025-39991
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2025Record 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=6.7
  2. Affected versionversion=7db88b962f06a52af5e9a32971012e8f3427cec0 <1f52119809b76d43759fc47da1cf708690b740a1
  3. Affected versionversion=7db88b962f06a52af5e9a32971012e8f3427cec0 <3fd2ef2ae2b5c955584a3bee8e83ae7d7a98f782
  4. Affected versionversion=7db88b962f06a52af5e9a32971012e8f3427cec0 <500fcc31e488d798937a23dbb1f62db46820c5b2
  5. Affected versionversion=7db88b962f06a52af5e9a32971012e8f3427cec0 <888830b2cbc035838bebefe94502976da94332a5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=7db88b962f06a52af5e9a32971012e8f3427cec0 <1f52119809b76d43759fc47da1cf708690b740a1; version=7db88b962f06a52af5e9a32971012e8f3427cec0 <3fd2ef2ae2b5c955584a3bee8e83ae7d7a98f782; version=7db88b962f06a52af5e9a32971012e8f3427cec0 <500fcc31e488d798937a23dbb1f62db46820c5b2; version=7db88b962f06a52af5e9a32971012e8f3427cec0 <888830b2cbc035838bebefe94502976da94332a5

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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.

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Technologies

Your stack

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Your stack

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