Bug 2517055 (CVE-2026-74526)

Summary: CVE-2026-74526 kernel: scsi: mpi3mr: Fix potential deadlock in mpi3mr_fault_uevent_emit
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's mpi3mr SCSI driver. When the `mpi3mr_fault_uevent_emit()` function is called from fault watchdog or reset paths, memory allocation requests can trigger a reclaim process. This reclaim process may then wait on host I/O that is already blocked, leading to a system deadlock. This can result in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-08-15 12:47:15 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-08-19 17:49:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081545-CVE-2026-74526-09fd@gregkh/T