CVE-2026-43426 usb: renesas_usbhs: fix use-after-free in ISR during device removal
A use-after-free in the Renesas USBHS driver allows attackers to cause denial of service or execute code during device removal.
- 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-2026-43426?
CVE-2026-43426 is a high-severity use after free 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: renesas_usbhs: fix use-after-free in ISR during device removal
In usbhs_remove(), the driver frees resources (including the pipe array) while the interrupt handler (usbhs_interrupt) is still registered. If an interrupt fires after usbhs_pipe_remove() but before the driver is fully unbound, the ISR may access freed memory, causing a use-after-free.
Fix this by calling devm_free_irq() before freeing resources. This ensures the interrupt handler is both disabled and synchronized (waits for any running ISR to complete) before usbhs_pipe_remove() is called.
Weakness: CWE-416
Which versions are affected by CVE-2026-43426?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43426?
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-2026-43426 being exploited?
There is no known exploitation of CVE-2026-43426 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43426, DEBIAN-CVE-2026-43426, GHSA-6vj2-gjw9-6mgj, ROOT-OS-DEBIAN-11-CVE-2026-43426, ROOT-OS-UBUNTU-2204-CVE-2026-43426, ROOT-OS-UBUNTU-2404-CVE-2026-43426 and 1 more.