In the Linux kernel, the following vulnerability has been resolved: md: wake raid456 reshape...
🔗 CVE IDs covered (1)
📋 Description
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.
🔗 References (6)
- https://nvd.nist.gov/vuln/detail/CVE-2026-53123
- https://git.kernel.org/stable/c/8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0
- https://git.kernel.org/stable/c/8b6a72420821e6da2cab6a69d5233500d2698b93
- https://git.kernel.org/stable/c/cf86bb53b9c92354904a328e947a05ffbfdd1840
- https://git.kernel.org/stable/c/ff6b93410192b812d73cc54062529715b2dc849f
- https://github.com/advisories/GHSA-26h7-ghcj-373h