Vulnerability-Lookup

CVE-2026-64372 (GCVE-0-2026-64372)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

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

Summary

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

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8e454e9d0bc03446d…
https://git.kernel.org/stable/c/632666a63116d8061…
https://git.kernel.org/stable/c/5cdb25f144b101083…
https://git.kernel.org/stable/c/982c9f92d57bda2b7…
https://git.kernel.org/stable/c/a36ca93a8ba57464e…
https://git.kernel.org/stable/c/6ba6f6783be2ffeb2…
https://git.kernel.org/stable/c/0e3c739a2f6fc1de5…
https://git.kernel.org/stable/c/266d3dd8b757b48a5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 8e454e9d0bc03446d610ee49abec9dfd424f6541 (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 632666a63116d8061c62a988d1ca39dcd6d27c9b (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 5cdb25f144b101083d8bf3fd023ad87fbe6850d7 (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 982c9f92d57bda2b769851ff6d90d43dcf5f3734 (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < a36ca93a8ba57464e521d70a337d37f069064111 (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 (git) Affected: 0f1d683fb35d6c6f49ef696c95757f3970682a0e , < 266d3dd8b757b48a576e90f018b51f7b7563cc32 (git)
Linux	Linux	Affected: 2.6.34 Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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              "versionType": "semver"
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        }
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                }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:24.733Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32"
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      ],
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    "datePublished": "2026-07-25T08:50:24.733Z",
    "dateReserved": "2026-07-19T15:36:31.783Z",
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      "date": "2026-07-26",
      "epss": "0.00177",
      "percentile": "0.07467"
    },
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/cpufreq/pcc-cpufreq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"8e454e9d0bc03446d610ee49abec9dfd424f6541\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"632666a63116d8061c62a988d1ca39dcd6d27c9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"5cdb25f144b101083d8bf3fd023ad87fbe6850d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"982c9f92d57bda2b769851ff6d90d43dcf5f3734\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"a36ca93a8ba57464e521d70a337d37f069064111\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f1d683fb35d6c6f49ef696c95757f3970682a0e\",\"lessThan\":\"266d3dd8b757b48a576e90f018b51f7b7563cc32\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/cpufreq/pcc-cpufreq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.34\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.34\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:00:44Z",
      "cve": "CVE-2026-64372",
      "id": "CVE-2026-64372",
      "initial_release_date": "2026-07-25T16:00:44Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64372",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64372.json",
      "version": "2"
    }
  }
}

GHSA-987R-R7FX-F5CM

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

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.

Show details on source website

JSON

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{
  "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": null
  },
  "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": "2026-07-25T12:31:33Z",
  "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": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64372 (GCVE-0-2026-64372)

GHSA-987R-R7FX-F5CM

Tags

Sightings

Nomenclature