Improper control of a resource through its lifetime in Linux kernel - CVE-2026-31448
Published: April 24, 2026
Vulnerability identifier: #VU127703
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-2026-31448
CWE-ID: CWE-664
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 state management in ext4_ext_map_blocks() and ext4_xattr_block_set() when handling mkdir or mknod operations after a failed extent insertion. A local user can trigger filesystem operations that leave residual extent metadata to cause a denial of service.
The issue can result in an infinite loop and prolonged blocking while the inode lock is not released.
How to mitigate CVE-2026-31448
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/3a7667595bcad84da53fc156a418e110267c3412
- https://git.kernel.org/stable/c/416c86f30f91b4fb2642ef6b102596ca898f41a5
- https://git.kernel.org/stable/c/5422fe71d26d42af6c454ca9527faaad4e677d6c
- https://git.kernel.org/stable/c/64f425b06b3bea9abc8977fd3982779b3ad070c9
- https://git.kernel.org/stable/c/c66545e83a802c3851d9be27a41c0479dd29ff0c
- https://git.kernel.org/stable/c/ecc50bfca9b5c2ee6aeef998181689b80477367b