CVE-2026-90400
UnknownSummary
In the Linux kernel's md (RAID) subsystem, a race condition exists between the raid10d thread and normal I/O operations. Spare device configuration changes can occur without suspending the array, leading to a NULL pointer dereference and kernel crash.
Risk Assessment
Can cause a kernel panic and server unavailability, and in extreme cases data loss on the RAID array. Affects systems running RAID10 arrays on Linux.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-90400. Until patched, avoid concurrent spare device reconfiguration and heavy I/O on RAID arrays.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: md: recheck spare changes before starting sync remove_spares() and remove_and_add_spares() modify the array's rdev configuration. These operations are only safe after the array has been suspended. md_start_sync() checks whether spare configuration changes are needed before taking reconfig_mutex. However, the rdev state can change before the mutex is acquired, so the initial check can become stale. In that case, md_choose_sync_action() may remove or replace rdevs while normal I/O is still accessing them. The race can occur as follows: raid10d Worker Normal IO ____________ _______________________ ______________________ raid10_write_request() wait_blocked_dev() set Blocked set Faulty Skip Faulty rdev rrdev->nr_pending++ .repl_bio = bio removeable_rdev = false . array not suspended . lock mddev goto err_handle lock mddev (wait) . update sb . clear Blocked . . unlock mddev . lock mddev (acquires) remove_spares() removeable_rdev = true raid10_remove_disk() rdev = replacement replacement = NULL rdev_dec_pending(NULL) unlock mddev (NULL)->nr_pending-- In this case, rdev_dec_pending() is called with a NULL pointer, resulting in a NULL pointer dereference when attempting to decrement nr_pending. Fix this by suspending the array when spare configuration changes are needed, including for non-read-write arrays, and checking again after taking reconfig_mutex. If the array was not already suspended and a change is now needed, release the mutex, suspend the array, and reacquire the mutex before continuing.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS