Race condition in Linux kernel - CVE-2026-45892
Published: May 28, 2026
Vulnerability identifier: #VU132594
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-2026-45892
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 improper synchronization in ext4 extent status tree handling in ext4_split_extent() when processing buffered writes to the middle of an unwritten extent without dioread_nolock enabled. A local user can trigger a stale unwritten extent entry to cause a denial of service.
The issue occurs when splitting an unwritten extent in the middle and converting it to initialized after a partial zeroout operation leaves extent status information inconsistent with the on-disk extent state.
How to mitigate CVE-2026-45892
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/6d882ea3b0931b43530d44149b79fcd4ffc13030
- https://git.kernel.org/stable/c/a1b962a821e7a52d48212ae269b45808b4411267
- https://git.kernel.org/stable/c/c2ee51d684adca7645e4aa74adca13f6750390bc
- https://git.kernel.org/stable/c/d8ee559fccdef713f058cfe5f2c03dc9b18be3b1
- https://git.kernel.org/stable/c/f0931a5c17005a0c4fc35bd1a001245effc3354b