Vulnerability-Lookup

FKIE_CVE-2026-64372

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-09-08 15:03

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/pcc-cpufreq.c"
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      ],
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  "cveTags": [],
  "descriptions": [
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      "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."
    }
  ],
  "id": "CVE-2026-64372",
  "lastModified": "2026-09-08T15:03:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
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  "published": "2026-07-25T10:17:20.147",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:54

Title

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

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

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 , ≤ * (original_commit_for_fix)

Show details on NVD website

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/pcc-cpufreq.c"
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      "cpeApplicability": [
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                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached during local initialization of the x86 PCC cpufreq driver on systems exposing the required ACPI PCC objects; no network, radio, or hot-plug input reaches this path.\nAC:L - Once two-phase _OSC negotiation succeeds, the stale-buffer write and subsequent double free occur deterministically without a race or other condition beyond attacker influence.\nPR:L - PCC platform-device creation and driver probing can occur automatically during boot or module autoload, leaving exploitable heap corruption without the attacker needing CAP_SYS_MODULE. A basic local user can groom and consume the resulting overlapping or corrupted slab objects.\nUI:N - The vulnerable driver probe and _OSC negotiation occur automatically and require no victim action.\nS:U - The corruption affects the host kernel within the same security authority and does not inherently cross a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free and double free can produce overlapping kernel heap objects, enabling disclosure of arbitrary kernel memory.\nI:H - The freed-object write and allocator freelist corruption can enable arbitrary kernel-memory modification and control-flow hijacking.\nA:H - Hardened allocators may immediately detect the double free and stop the kernel, while other configurations can crash or panic from the corrupted slab freelist."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:54:22.197Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541"
        },
        {
          "url": "https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734"
        },
        {
          "url": "https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29"
        },
        {
          "url": "https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32"
        }
      ],
      "title": "cpufreq: pcc: fix use-after-free and double free in _OSC evaluation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64372",
    "datePublished": "2026-07-25T08:50:24.733Z",
    "dateReserved": "2026-07-19T15:36:31.783Z",
    "dateUpdated": "2026-08-17T04:54:22.197Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2026-64372

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

Tags

Sightings

Nomenclature