CVE-2026-74375 md/raid1,raid10: fix deadlock in read error recovery path
A deadlock in the Linux kernel RAID1/10 read error recovery path allows local attackers to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74375?
CVE-2026-74375 is a denial of service vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
md/raid1,raid10: fix deadlock in read error recovery path
raid1d and raid10d may resubmit a split md cloned bio while handling a read error. In this case, resubmitting the bio can lead to a deadlock if the array is suspended before md_handle_request() acquires an active_io reference via percpu_ref_tryget_live().
Since the cloned bio already holds an active_io reference, trying to acquire another reference via percpu_ref_tryget_live() can lead to a deadlock while the array is suspended.
Fix this by using percpu_ref_get() for md cloned bios.
Which versions are affected by CVE-2026-74375?
How do I fix CVE-2026-74375?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-74375 being exploited?
There is no known exploitation of CVE-2026-74375 in the wild and no public exploit code.
Sources
Also known as AZL-96420, BELL-CVE-2026-74375, DEBIAN-CVE-2026-74375, GHSA-xhm4-9f9x-w7xp, UBUNTU-CVE-2026-74375.