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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-64372

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64372

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "drivers/cpufreq/pcc-cpufreq.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.34"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.34",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.96",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/cpufreq/pcc-cpufreq.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64372

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41016 · Revision 1
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Publisher date
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