Race condition in Linux kernel - CVE-2026-31575
Published: April 25, 2026
Vulnerability identifier: #VU127816
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-2026-31575
CWE-ID: CWE-362
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 race condition in mfill_atomic_hugetlb() when handling userfaultfd hugetlb faults. A local user can trigger faults on different addresses within the same huge page to cause a denial of service.
The issue can corrupt the reservation map and trigger the BUG_ON in resv_map_release().
How to mitigate CVE-2026-31575
Install security update from vendor's repository.