Improper control of a resource through its lifetime in Linux kernel - CVE-2026-45985
Published: May 28, 2026
Vulnerability identifier: #VU132510
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45985
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 disclose sensitive information.
The vulnerability exists due to improper extent state handling in ext4_split_convert_extents() when allocating blocks during within-EOF direct I/O and writeback with dioread_nolock enabled. A local user can trigger a failed direct I/O write that splits an unwritten extent to disclose sensitive information.
The issue can occur when a temporary ENOSPC condition happens during extent splitting, causing inconsistency between the on-disk extent state and the extent status tree.
How to mitigate CVE-2026-45985
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2698731d25823267c29190cb578da9296a0c0d7b
- https://git.kernel.org/stable/c/2920ec61c98b9476781359f05b94da84e80f54d4
- https://git.kernel.org/stable/c/37555690f39f78ef69af347d9aff897e07445949
- https://git.kernel.org/stable/c/67cdb7bd7442bd3cdc6d6088bbb2df9be2fe936c
- https://git.kernel.org/stable/c/716e7439a5a9b18c3ff882c2f8c834b9ced1aaec
- https://git.kernel.org/stable/c/77e407967cd872cd75d7e4a691908e49c8e6b4d4
- https://git.kernel.org/stable/c/feaf2a80e78f89ee8a3464126077ba8683b62791