GHSA-987R-R7FX-F5CM

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: pcc: fix use-after-free and double free in _OSC evaluation

pcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the two-phase _OSC negotiation. Between the two calls it freed output.pointer but left output.length unchanged. Since acpi_evaluate_object() treats a non-zero length with a non-NULL pointer as an existing buffer to write into, the second call wrote into freed memory (use-after-free). The subsequent kfree(output.pointer) at out_free then freed the same pointer a second time (double free).

Reset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER after freeing the first result, so ACPICA allocates a fresh buffer for each phase independently.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-64372"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:20Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: pcc: fix use-after-free and double free in _OSC evaluation\n\npcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the\ntwo-phase _OSC negotiation. Between the two calls it freed\noutput.pointer but left output.length unchanged. Since\nacpi_evaluate_object() treats a non-zero length with a non-NULL\npointer as an existing buffer to write into, the second call wrote\ninto freed memory (use-after-free). The subsequent kfree(output.pointer)\nat out_free then freed the same pointer a second time (double free).\n\nReset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER\nafter freeing the first result, so ACPICA allocates a fresh buffer for\neach phase independently.",
  "id": "GHSA-987r-r7fx-f5cm",
  "modified": "2026-07-27T06:30:34Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64372"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.