CVE-2026-45867

System crash via act8945a IRQ teardown race

Published May 27, 2026 · Updated May 27, 2026

Use-after-free in the act8945a power supply driver in Linux Kernel allows local users to crash the system during driver teardown. The driver requests its managed IRQ before registering the managed power_supply handle, so reverse-order cleanup frees the handle while the IRQ handler can still pass it to power_supply_changed(). Reachability requires an ACT8945A-backed system and an interrupt during driver removal or probe; the bounded outcomes are a crash or silent kernel-memory corruption.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the act8945a power supply driver in Linux Kernel allows local users to crash the system during driver teardown. The driver requests its managed IRQ before registering the managed power_supply handle, so reverse-order cleanup frees the handle while the IRQ handler can still pass it to power_supply_changed(). Reachability requires an ACT8945A-backed system and an interrupt during driver removal or probe; the bounded outcomes are a crash or silent kernel-memory corruption.

The record

CVE
CVE-2026-45867
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=4.9
  2. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <0768e8525a46df103647ca5059b32320d7fd17e4
  3. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <3291c51d4684d048dd2eb91b5b65fcfdaf72141f
  4. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <697bb5dc0cb4791e244f3970b067bc1ef33be9d9
  5. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <76a42ba547a9b2e2337894f67a4d9247445007d5
  6. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <83c1bd466c514cb24ca6ef347c5aac76a13c4e1e
  7. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <d023ef9f748b2090f7a9dbdd5c622b6ad99088ea
  8. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <f27eb76def5c07e4d7cc468b40741f19dafc83ce
  9. Affected versionversion=a09209acd6a808794bdd7866af3678d1fd1d90e7 <f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.9; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <0768e8525a46df103647ca5059b32320d7fd17e4; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <3291c51d4684d048dd2eb91b5b65fcfdaf72141f; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <697bb5dc0cb4791e244f3970b067bc1ef33be9d9; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <76a42ba547a9b2e2337894f67a4d9247445007d5; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <83c1bd466c514cb24ca6ef347c5aac76a13c4e1e; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <d023ef9f748b2090f7a9dbdd5c622b6ad99088ea; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <f27eb76def5c07e4d7cc468b40741f19dafc83ce; version=a09209acd6a808794bdd7866af3678d1fd1d90e7 <f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3

Published CVSS scores

5.0SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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

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

CWE-416Use After Free
T1499.004Application 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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