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VulnerabilityPublished Updated

CVE-2026-64512: Linux kernel · ACPI: CPPC: Suppress UBSAN warning caused by field misuse

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 3 Nov 2026, 18:43 UTC

Severity
Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Linux LinuxAffected
  • 5.15.154 – 6.8.9
4 affected builds
Fixed in–

AI-suggested

A fix is available and has been applied to the Linux kernel source to validate the region type and access_width before use, preventing the UBSAN warning. Users should update to patched kernel versions to remediate this issue.

Description

CVE-2026-64512 is a vulnerability in the Linux kernel's ACPI CPPC driver where misuse of a field causes a UBSAN (Undefined Behavior Sanitizer) warning. The issue arises because the meaning of the reg->access_width field varies depending on reg->space_id, leading to a shift-out-of-bounds error when the value is greater than 4. The vulnerability has been resolved by validating the region type and access_width value before use.

References

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