CVE-2026-31582

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4381a36abdf1c5c0323c1c51f869dc000115eb20 < c78e1d4e48f23792adaa7c94251e22b0d9700a39affected
LinuxLinux4381a36abdf1c5c0323c1c51f869dc000115eb20 < 9e1b798257f96d2e2a2639830eb71add545ce749affected
LinuxLinux4381a36abdf1c5c0323c1c51f869dc000115eb20 < 7003ae4810ca83f0ddca85b768500e313c4b998caffected
LinuxLinux4381a36abdf1c5c0323c1c51f869dc000115eb20 < 61f2aa23b0ce8d7aa5071ed25a7471e246a4fdd4affected
LinuxLinux4381a36abdf1c5c0323c1c51f869dc000115eb20 < 08e57f5e1a9067d5fbf33993aa7f51d60b3d13a4affected
LinuxLinux6.7affected
LinuxLinux0 < 6.7unaffected
LinuxLinux6.12.83 <= 6.12.*unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0.1 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References