CVE-2026-74458 can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extents
A flaw in the Linux kernel Kvaser USB CAN driver allows memory corruption via malformed USB commands, 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
- Not needed
- Fix
- Available
What is CVE-2026-74458?
CVE-2026-74458 is a memory corruption 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:
can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extents
The wait and bulk receive paths walk variable-length commands from a USB buffer. A nonzero command shorter than CMD_HEADER_LEN can still be dispatched, and the wait path copies a matching command into a fixed caller-owned struct kvaser_cmd using the device-provided length.
Reject nonzero commands that do not contain the fixed header or that extend beyond the current USB buffer item. In the wait path, also reject a matching command that exceeds the destination before copying it.
Which versions are affected by CVE-2026-74458?
How do I fix CVE-2026-74458?
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-2026-74458 being exploited?
There is no known exploitation of CVE-2026-74458 in the wild and no public exploit code.
Sources
Also known as AZL-96111, BELL-CVE-2026-74458, DEBIAN-CVE-2026-74458, GHSA-2x39-h24h-r965, UBUNTU-CVE-2026-74458.