Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-64151
Published: July 20, 2026
Vulnerability identifier: #VU138469
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-2026-64151
CWE-ID: CWE-754
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 a missing page size check in iommupt page table mapping logic when mapping a range with PAGE_SIZE. A local user can trigger the affected mapping path to cause a denial of service.
The issue arises when PAGE_SIZE is missing from the pgsize_bitmap during use of the fast path.
How to mitigate CVE-2026-64151
Install security update from vendor's repository.