CVE-2026-31758 usb: usbtmc: Flush anchored URBs in usbtmc_release
A use-after-free vulnerability in the Linux kernel's USB TMC driver allows attackers to potentially execute code or escalate privileges via crafted USB interactions.
- 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-2026-31758?
CVE-2026-31758 is a high-severity use after free vulnerability in Linux kernel, published on 1 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: Flush anchored URBs in usbtmc_release
When calling usbtmc_release, pending anchored URBs must be flushed or killed to prevent use-after-free errors (e.g. in the HCD giveback path). Call usbtmc_draw_down() to allow anchored URBs to be completed.
Weakness: CWE-416
Which versions are affected by CVE-2026-31758?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31758?
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-2026-31758 being exploited?
There is no known exploitation of CVE-2026-31758 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31758, DEBIAN-CVE-2026-31758, GHSA-3cf5-6mrm-j6q3, ROOT-OS-DEBIAN-11-CVE-2026-31758, ROOT-OS-UBUNTU-2204-CVE-2026-31758, ROOT-OS-UBUNTU-2404-CVE-2026-31758 and 1 more.