PT-2026-32352 · Linux · Linux Kernel

Published 2026-04-13 · Updated 2026-04-25 · CVE-2026-31426

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A use-after-free issue exists in the ACPI EC component. When the ec install handlers() function returns a -EPROBE DEFER error on reduced-hardware platforms, the acpi ec setup() function fails to perform necessary cleanup. This leads the acpi ec add() function to free the struct acpi ec for non-boot instances, leaving a dangling handler context. Subsequent AML evaluations accessing an EC OpRegion field trigger the acpi ec space handler() function using the freed pointer. This can be exercised via unprivileged sysfs reads that cause AML to access EC OpRegions such as battery, thermal, or backlight.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-31426

ECHO-05F2-3C6C-FD6B

OESA-2026-2075

OESA-2026-2076

OESA-2026-2077

Affected Products

Linux Kernel

References · 34

• https://osv.dev/vulnerability/OESA-2026-2077 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31426 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2026-31426 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-31426 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23171 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31426 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31426 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23439 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31400 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31402 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-71078 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31426 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-31426 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31426 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2076 · Vendor Advisory