# CVE-2026-31582

> Vulnerability · severity: **HIGH** (CVSS 7.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-31582
- **Published:** 2026-04-24
- **CVSS severity:** HIGH
- **CVSS base score:** 7.8
- **CWE codes:** CWE-416

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31582

## Citation

> AI Analytics. CVE-2026-31582. Retrieved 2026-08-02 from https://api.ai-analytics.org/cve/CVE-2026-31582. Derived from NIST NVD. Licensed CC0.

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