SB2026072744 - Improper input validation in Linux kernel acpi driver

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Main Vulnerability Database SB2026072744

SB2026072744 - Improper input validation in Linux kernel acpi driver

Published: July 27, 2026

Security Bulletin ID SB2026072744
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-64512)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local attacker to cause a denial of service.

The vulnerability exists due to improper input validation in the ACPI CPPC register width handling in drivers/acpi/cppc_acpi.c when processing ACPI PCC register definitions. A local attacker can provide a crafted access_width value to trigger a shift-out-of-bounds condition and cause a denial of service.

The issue occurs because the access_width field is reused as a PCC subspace identifier for ACPI_ADR_SPACE_PLATFORM_COMM entries.


Remediation

Install update from vendor's website.

References