CVE-2026-31582 (GCVE-0-2026-31582)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42
VLAI?
Title
hwmon: (powerz) Fix use-after-free on USB disconnect
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c78e1d4e48f23792adaa7c94251e22b0d9700a39 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9e1b798257f96d2e2a2639830eb71add545ce749 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7003ae4810ca83f0ddca85b768500e313c4b998c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 61f2aa23b0ce8d7aa5071ed25a7471e246a4fdd4 (git)
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    Linux Linux Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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          "programFiles": [
            "drivers/hwmon/powerz.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (powerz) Fix use-after-free on USB disconnect\n\nAfter powerz_disconnect() frees the URB and releases the mutex, a\nsubsequent powerz_read() call can acquire the mutex and call\npowerz_read_data(), which dereferences the freed URB pointer.\n\nFix by:\n - Setting priv-\u003eurb to NULL in powerz_disconnect() so that\n   powerz_read_data() can detect the disconnected state.\n - Adding a !priv-\u003eurb check at the start of powerz_read_data()\n   to return -ENODEV on a disconnected device.\n - Moving usb_set_intfdata() before hwmon registration so the\n   disconnect handler can always find the priv pointer."
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      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:42:12.257Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "hwmon: (powerz) Fix use-after-free on USB disconnect",
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    "datePublished": "2026-04-24T14:42:12.257Z",
    "dateReserved": "2026-03-09T15:48:24.119Z",
    "dateUpdated": "2026-04-24T14:42:12.257Z",
    "state": "PUBLISHED"
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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