CVE-2026-31426

Kernel memory corruption via stale ACPI EC handler

Published Apr 13, 2026 · Updated Apr 13, 2026

Use-after-free in the Linux Kernel ACPI EC driver allows local users to trigger kernel memory corruption through an unprivileged sysfs read. When ec_install_handlers returns EPROBE_DEFER, acpi_ec_setup omits cleanup and acpi_ec_add frees the EC context still registered with ACPICA. Reduced-hardware EC platforms with a deferred GPIO IRQ provider are exposed; later AML access to an EC OpRegion dereferences the stale context, causing a kernel crash or memory corruption.

CVSS severity7.0
High
EPSS probability0.11%
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 Linux Kernel ACPI EC driver allows local users to trigger kernel memory corruption through an unprivileged sysfs read. When ec_install_handlers returns EPROBE_DEFER, acpi_ec_setup omits cleanup and acpi_ec_add frees the EC context still registered with ACPICA. Reduced-hardware EC platforms with a deferred GPIO IRQ provider are exposed; later AML access to an EC OpRegion dereferences the stale context, causing a kernel crash or memory corruption.

The record

CVE
CVE-2026-31426
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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=03e9a0e05739cf872fee494b06c75c0469704a21 <022d1727f33ff90b3e1775125264e3023901952e
  2. Affected versionversion=03e9a0e05739cf872fee494b06c75c0469704a21 <808c0f156f48d5b8ca34088cbbfba8444e606cbc
  3. Affected versionversion=03e9a0e05739cf872fee494b06c75c0469704a21 <9c886e63b69658959633937e3acb7ca8addf7499
  4. Affected versionversion=03e9a0e05739cf872fee494b06c75c0469704a21 <be1a827e15991e874e0d5222d0ea5fdad01960fe
  5. Affected versionversion=03e9a0e05739cf872fee494b06c75c0469704a21 <d04c007047c88158141d9bd5eac761cdadd3782c
  6. Affected versionversion=03e9a0e05739cf872fee494b06c75c0469704a21 <f6484cadbcaf26b5844b51bd7307a663dda48ef6
  7. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=03e9a0e05739cf872fee494b06c75c0469704a21 <022d1727f33ff90b3e1775125264e3023901952e; version=03e9a0e05739cf872fee494b06c75c0469704a21 <808c0f156f48d5b8ca34088cbbfba8444e606cbc; version=03e9a0e05739cf872fee494b06c75c0469704a21 <9c886e63b69658959633937e3acb7ca8addf7499; version=03e9a0e05739cf872fee494b06c75c0469704a21 <be1a827e15991e874e0d5222d0ea5fdad01960fe; version=03e9a0e05739cf872fee494b06c75c0469704a21 <d04c007047c88158141d9bd5eac761cdadd3782c; version=03e9a0e05739cf872fee494b06c75c0469704a21 <f6484cadbcaf26b5844b51bd7307a663dda48ef6; version=5.7

Published CVSS scores

5.8Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
5.8Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
7.0kernel.orgCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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

CWE-416Use After Free
T1499Endpoint Denial of Service

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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