NuytsTech Security

CVE-2026-31582

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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.

More information : https://git.kernel.org/stable/c/08e57f5e1a9067d5fbf33993aa7f51d60b3d13a4

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