CVE-2025-40345 usb: storage: sddr55: Reject out-of-bound new_pba
A malicious USB device can trigger heap memory corruption in the Linux kernel sddr55 driver, potentially leading to code execution or system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-40345?
CVE-2025-40345 is a memory corruption vulnerability in Linux, published on 12 Dec 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
usb: storage: sddr55: Reject out-of-bound new_pba
Discovered by Atuin - Automated Vulnerability Discovery Engine.
new_pba comes from the status packet returned after each write. A bogus device could report values beyond the block count derived from info->capacity, letting the driver walk off the end of pba_to_lba[] and corrupt heap memory.
Reject PBAs that exceed the computed block count and fail the transfer so we avoid touching out-of-range mapping entries.
Which versions are affected by CVE-2025-40345?
How do I fix CVE-2025-40345?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-40345 being exploited?
There is no known exploitation of CVE-2025-40345 in the wild and no public exploit code.
Sources
Also known as AZL-72332, BELL-CVE-2025-40345, DEBIAN-CVE-2025-40345, GHSA-9r78-47qh-www2, ROOT-OS-DEBIAN-12-CVE-2025-40345, ROOT-OS-DEBIAN-13-CVE-2025-40345 and 3 more.