CVE-2026-31582
hwmon: (powerz) Fix use-after-free on USB disconnect
Summary
hwmon: (powerz) Fix use-after-free on USB disconnect
Original description
The description as published by the source.
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 packages
Linux
Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.20.0"},{"fixed":"7.0.1"}]}]
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-31582 linux-lts Fixed in: 6.12.85-r0
- Debian DEBIAN-CVE-2026-31582 linux Fixed in: 6.12.85-1
- Ubuntu UBUNTU-CVE-2026-31582 linux-hwe-edge
References
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org