CVE-2026-53123

In the Linux kernel, the following vulnerability has been resolved:

md: wake raid456 reshape waiters before suspend

During raid456 reshape, direct IO across the reshape position can sleep

in raid5_make_request() waiting for reshape progress while still

holding an active_io reference. If userspace then freezes reshape and

writes md/suspend_lo or md/suspend_hi, mddev_suspend() kills active_io

and waits for all in-flight IO to drain.

This can deadlock: the IO needs reshape progress to continue, but the

reshape thread is already frozen, so the active_io reference is never

dropped and suspend never completes.

raid5_prepare_suspend() already wakes wait_for_reshape for dm-raid. Do

the same for normal md suspend when reshape is already interrupted, so

waiting raid456 IO can abort, drop its reference, and let suspend

finish.

The mdadm test tests/25raid456-reshape-deadlock reproduces the hang.