CVE-2026-74457 can: peak_usb: add bounds check for USB channel index
A missing bounds check in the Linux kernel peak_usb driver allows a local attacker with USB access to trigger a heap out-of-bounds read, causing a kernel panic.
- 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-2026-74457?
CVE-2026-74457 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: peak_usb: add bounds check for USB channel index
The channel control index ctrl_idx is derived from rx->len which comes directly from a device USB payload. The mask 0x0f allows values 0-15, but the array size of usb_if->dev[] is only 2. Values 2-15 cause heap out-of-bounds read, eventually causing kernel panic in the IRQ context.
Add bounds checking for ctrl_idx before the array access in both pcan_usb_pro_handle_canmsg() and pcan_usb_pro_handle_error().
Which versions are affected by CVE-2026-74457?
How do I fix CVE-2026-74457?
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-2026-74457 being exploited?
There is no known exploitation of CVE-2026-74457 in the wild and no public exploit code.
Sources
Also known as AZL-96186, BELL-CVE-2026-74457, DEBIAN-CVE-2026-74457, GHSA-hc9g-h2c2-6wf9, UBUNTU-CVE-2026-74457.