Out-of-bounds write in Linux kernel - CVE-2026-31716
Published: May 2, 2026
Vulnerability identifier: #VU128983
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-2026-31716
CWE-ID: CWE-787
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 an out-of-bounds write in journal replay file record handling in fs/ntfs3 when processing a corrupted filesystem during journal replay. A local user can provide a crafted filesystem image with invalid file record metadata to cause a denial of service.
The issue occurs when the file record used size is smaller than a validated attribute offset or larger than the record size, causing length calculations for memmove operations to underflow.
How to mitigate CVE-2026-31716
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0112e6279420d4005b3d57af36fb45c01b8d0116
- https://git.kernel.org/stable/c/0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b
- https://git.kernel.org/stable/c/4b1613d7e2deda831a97e427d1ea586e50fe1be5
- https://git.kernel.org/stable/c/f79d0403ea20a81bc29105bba54fbcab54e8c403
- https://git.kernel.org/stable/c/f90b8a1798b750755a9e9aee66678f0a1820bbaf