Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-43118
Published: May 7, 2026
Vulnerability identifier: #VU130645
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43118
CWE-ID: CWE-670
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 data corruption.
The vulnerability exists due to improper handling of inode size during log replay in btrfs inode logging and log replay code when replaying a filesystem log after specific inode operations. A local user can create and truncate a file, create a hard link or rename it, and trigger log replay to cause data corruption.
The issue occurs when an inode with a new size of 0 is later logged in exists mode, causing the preserved size from the subvolume tree to remain non-zero after replay.
How to mitigate CVE-2026-43118
Install security update from vendor's repository.