CVE-2026-31582 hwmon: (powerz) Fix use-after-free on USB disconnect
A use-after-free vulnerability in the Linux kernel powerz driver allows attackers to cause denial of service or execute code via USB disconnect events.
- 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-2026-31582?
CVE-2026-31582 is a high-severity use after free vulnerability in Linux kernel, published on 24 Apr 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:
hwmon: (powerz) Fix use-after-free on USB disconnect
After powerz_disconnect() frees the URB and releases the mutex, a subsequent powerz_read() call can acquire the mutex and call powerz_read_data(), which dereferences the freed URB pointer.
Fix by: - Setting priv->urb to NULL in powerz_disconnect() so that powerz_read_data() can detect the disconnected state. - Adding a !priv->urb check at the start of powerz_read_data() to return -ENODEV on a disconnected device. - Moving usb_set_intfdata() before hwmon registration so the disconnect handler can always find the priv pointer.
Weakness: CWE-416
Which versions are affected by CVE-2026-31582?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31582?
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-2026-31582 being exploited?
There is no known exploitation of CVE-2026-31582 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31582, DEBIAN-CVE-2026-31582, GHSA-7v66-mw99-f72x, ROOT-OS-UBUNTU-2404-CVE-2026-31582, UBUNTU-CVE-2026-31582.