CVE-2025-37861 scsi: mpi3mr: Synchronous access b/w reset and tm thread for reply queue

High 7.8 Published 9 May 2025 Updated 21 Oct 2026

A race condition in the mpi3mr driver causes a kernel crash when reset and task management threads access reply queues concurrently.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2025-37861?

CVE-2025-37861 is a high-severity use after free vulnerability in Linux kernel, published on 9 May 2025. 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: Synchronous access b/w reset and tm thread for reply queue

When the task management thread processes reply queues while the reset thread resets them, the task management thread accesses an invalid queue ID (0xFFFF), set by the reset thread, which points to unallocated memory, causing a crash.

Add flag 'io_admin_reset_sync' to synchronize access between the reset, I/O, and admin threads. Before a reset, the reset handler sets this flag to block I/O and admin processing threads. If any thread bypasses the initial check, the reset thread waits up to 10 seconds for processing to finish. If the wait exceeds 10 seconds, the controller is marked as unrecoverable.

Weakness: CWE-416

Which versions are affected by CVE-2025-37861?

It affects 1 product.

Linux distribution packages (40)

`bpftool-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:7.3.0-427.113.1.el9_4`
`kernel-64k-debug-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug-devel` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug-devel-matched` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-devel` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-devel-matched` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debug-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debug-devel` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debug-devel-matched` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debuginfo-common-aarch64` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debuginfo-common-ppc64le` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debuginfo-common-s390x` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-debuginfo-common-x86_64` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-devel` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-devel-matched` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-doc` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-rt-debug-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-rt-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-tools-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-zfcpdump-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-zfcpdump-devel` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-zfcpdump-devel-matched` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`libperf-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`perf` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`perf-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`python3-perf-debuginfo` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`rtla` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`rv` Red Hat:rhel_eus:9.4::appstream	All versions	`0:5.14.0-427.113.1.el9_4`
`bpftool` Red Hat:rhel_eus:9.4::baseos	All versions	`0:7.3.0-427.113.1.el9_4`
`bpftool-debuginfo` Red Hat:rhel_eus:9.4::baseos	All versions	`0:7.3.0-427.113.1.el9_4`
`kernel` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-core` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug-core` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug-debuginfo` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug-modules` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`
`kernel-64k-debug-modules-core` Red Hat:rhel_eus:9.4::baseos	All versions	`0:5.14.0-427.113.1.el9_4`

Products include Linux kernel.

How do I fix CVE-2025-37861?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2025-37861 being exploited?

There is no known exploitation of CVE-2025-37861 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as AZL-62498, AZL-70144, BELL-CVE-2025-37861, DEBIAN-CVE-2025-37861, GHSA-76hw-gx4c-xc29, RHSA-2026:3692 and 4 more.