CVE-2025-40001 scsi: mvsas: Fix use-after-free bugs in mvs_work_queue
A use-after-free vulnerability in the Linux kernel mvsas driver allows local attackers to cause denial of service or execute code during device detachment.
- 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-2025-40001?
CVE-2025-40001 is an use after free vulnerability in Linux, published on 18 Oct 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: mvsas: Fix use-after-free bugs in mvs_work_queue
During the detaching of Marvell's SAS/SATA controller, the original code calls cancel_delayed_work() in mvs_free() to cancel the delayed work item mwq->work_q. However, if mwq->work_q is already running, the cancel_delayed_work() may fail to cancel it. This can lead to use-after-free scenarios where mvs_free() frees the mvs_info while mvs_work_queue() is still executing and attempts to access the already-freed mvs_info.
A typical race condition is illustrated below:
CPU 0 (remove) | CPU 1 (delayed work callback) mvs_pci_remove() | mvs_free() | mvs_work_queue() cancel_delayed_work() | kfree(mvi) | | mvi-> // UAF
Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure that the delayed work item is properly canceled and any executing delayed work item completes before the mvs_info is deallocated.
This bug was found by static analysis.
Which versions are affected by CVE-2025-40001?
How do I fix CVE-2025-40001?
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-2025-40001 being exploited?
There is no known exploitation of CVE-2025-40001 in the wild and no public exploit code.
Sources
Also known as AZL-68585, BELL-CVE-2025-40001, DEBIAN-CVE-2025-40001, GHSA-q5hm-2p5x-hm8x, ROOT-OS-DEBIAN-11-CVE-2025-40001, ROOT-OS-DEBIAN-12-CVE-2025-40001 and 4 more.