Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64181
Published: July 20, 2026
Vulnerability identifier: #VU138432
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-2026-64181
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 handling of special page table mappings in __vm_normal_page() when processing huge PMD or PUD mappings on architectures without pmd_special()/pud_special() support. A local user can trigger memory management operations involving huge zero folios to cause a denial of service.
This issue is exposed on x86 32-bit systems with THP enabled.
How to mitigate CVE-2026-64181
Install security update from vendor's repository.