CVE-2026-74526 scsi: mpi3mr: Fix potential deadlock in mpi3mr_fault_uevent_emit
A deadlock in the mpi3mr SCSI driver can cause a denial of service when fault handling triggers memory reclaim on blocked I/O.
- 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-2026-74526?
CVE-2026-74526 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:
scsi: mpi3mr: Fix potential deadlock in mpi3mr_fault_uevent_emit
mpi3mr_fault_uevent_emit() runs from the fault watchdog and reset paths where host I/O may already be blocked. GFP_KERNEL allocations here, both the local kzalloc_obj() and the ones inside kobject_uevent_env() itself, can trigger reclaim that waits on that blocked I/O and deadlock.
Use memalloc_noio_save()/restore() to cover the whole call instead of just the local allocation.
Which versions are affected by CVE-2026-74526?
How do I fix CVE-2026-74526?
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-2026-74526 being exploited?
There is no known exploitation of CVE-2026-74526 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-74526, GHSA-j795-hxrf-343f, UBUNTU-CVE-2026-74526.