Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-89558
Published: September 12, 2026
Vulnerability identifier: #VU149248
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89558
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause silent data corruption.
The vulnerability exists due to incorrect control flow implementation in raid10_sync_request() in drivers/md/raid10.c when recovering RAID10 devices while another mirror remains missing. A local privileged user can write to a degraded RAID10 array and re-add affected devices to cause silent data corruption.
Exploitation requires bitmap-based recovery.
Affected software
Linux kernel
How to mitigate CVE-2026-89558
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3