Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64229
Published: July 27, 2026
Vulnerability identifier: #VU139758
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64229
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper hardware feature dependency handling in broadcast TLB flush logic when performing TLB invalidation with a non-zero PCID while PCID is disabled via the "nopcid" boot option. A local user can trigger memory-management operations that reach the broadcast TLB flush path to cause a denial of service.
The issue occurs only in the "nopcid" scenario on AMD CPUs that support INVLPGB, and can result in a general protection fault in the kernel.
How to mitigate CVE-2026-64229
Install security update from vendor's repository.