CVE-2026-31582: Linux kernel · hwmon: (powerz) Fix use-after-free on USB disconnect
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 12 Nov 2026, 00:34 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 24 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
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.
References
- git.kernel.org/stable/c/c78e1d4e48f23792adaa7c94251e22b0d9700a39 (opens in a new tab)
- git.kernel.org/stable/c/9e1b798257f96d2e2a2639830eb71add545ce749 (opens in a new tab)
- git.kernel.org/stable/c/7003ae4810ca83f0ddca85b768500e313c4b998c (opens in a new tab)
- git.kernel.org/stable/c/61f2aa23b0ce8d7aa5071ed25a7471e246a4fdd4 (opens in a new tab)
- git.kernel.org/stable/c/08e57f5e1a9067d5fbf33993aa7f51d60b3d13a4 (opens in a new tab)