CVE-2026-43429 USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts
A local attacker can hang kernel threads indefinitely by specifying long timeouts in USBTMC ioctl calls, causing a denial of service.
- 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-2026-43429?
CVE-2026-43429 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 May 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:
USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts
The usbtmc driver accepts timeout values specified by the user in an ioctl command, and uses these timeouts for some usb_bulk_msg() calls. Since the user can specify arbitrarily long timeouts and usb_bulk_msg() uses unkillable waits, call usb_bulk_msg_killable() instead to avoid the possibility of the user hanging a kernel thread indefinitely.
Which versions are affected by CVE-2026-43429?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43429?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43429 being exploited?
There is no known exploitation of CVE-2026-43429 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43429, DEBIAN-CVE-2026-43429, GHSA-f7gv-jp52-6999, ROOT-OS-DEBIAN-11-CVE-2026-43429, ROOT-OS-UBUNTU-2204-CVE-2026-43429, ROOT-OS-UBUNTU-2404-CVE-2026-43429 and 1 more.