Race condition in Linux kernel - CVE-2026-90400
Published: September 18, 2026
Vulnerability identifier: #VU151080
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90400
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a race condition in the md_start_sync() RAID synchronization path when spare configuration changes occur concurrently with normal I/O. A local privileged user can cause spare configuration changes to race with normal I/O to cause a denial of service.
The race can cause rdev_dec_pending() to be called with a NULL pointer.
Affected software
Linux kernel
How to mitigate CVE-2026-90400
Install security update from vendor's repository.