Memory leak in Linux kernel - CVE-2026-31654
Published: April 25, 2026
Vulnerability identifier: #VU127749
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31654
CWE-ID: CWE-401
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 a memory leak in __mmap_region() when handling a MAP_SHARED mmap of /dev/zero and a subsequent failure in VMA creation. A local user can trigger the error path to cause a denial of service.
Exploitation is reproducible with fault injection.
How to mitigate CVE-2026-31654
Install security update from vendor's repository.