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GHSA-2X57-5MR8-CJXJ

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

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

cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks

cpufreq_cpu_get() returns NULL when no cpufreq policy is associated with the requested CPU, for example because the CPU is offline or the policy has already been torn down. Both amd_pstate_power_supply_notifier() and amd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then pass that pointer to amd_pstate_get_balanced_epp() and amd_pstate_set_epp(), which dereference it unconditionally. A racing CPU hotplug or driver teardown can therefore lead to a NULL pointer dereference on either of these dynamic EPP paths.

The third cpufreq_cpu_get() caller in this file, amd_pstate_verify(), already handles the NULL case. Bring the two new callers in line with that pattern: return NOTIFY_OK from the power-supply notifier (matching the other "nothing to do" exits) and -ENODEV from amd_pstate_profile_set() (the usual cpufreq error for a missing CPU policy).

Found by code inspection; not tested on hardware.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-92492"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks\n\ncpufreq_cpu_get() returns NULL when no cpufreq policy is associated with\nthe requested CPU, for example because the CPU is offline or the policy\nhas already been torn down.  Both amd_pstate_power_supply_notifier() and\namd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then\npass that pointer to amd_pstate_get_balanced_epp() and\namd_pstate_set_epp(), which dereference it unconditionally.  A racing\nCPU hotplug or driver teardown can therefore lead to a NULL pointer\ndereference on either of these dynamic EPP paths.\n\nThe third cpufreq_cpu_get() caller in this file, amd_pstate_verify(),\nalready handles the NULL case.  Bring the two new callers in line with\nthat pattern: return NOTIFY_OK from the power-supply notifier (matching\nthe other \"nothing to do\" exits) and -ENODEV from amd_pstate_profile_set()\n(the usual cpufreq error for a missing CPU policy).\n\nFound by code inspection; not tested on hardware.",
  "id": "GHSA-2x57-5mr8-cjxj",
  "modified": "2026-09-17T18:32:06Z",
  "published": "2026-09-17T18:32:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92492"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39c0cf62fc7851a17782e7efe8dfb2948739c681"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70c8c8b50d80f681f50ddcc66a9400dd87508913"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4ade8d224756ab69f108204dde6777bac4664e4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-92492 (GCVE-0-2026-92492)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-17 16:10

Title

cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks

Summary

In the Linux kernel, the following vulnerability has been resolved: cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks cpufreq_cpu_get() returns NULL when no cpufreq policy is associated with the requested CPU, for example because the CPU is offline or the policy has already been torn down. Both amd_pstate_power_supply_notifier() and amd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then pass that pointer to amd_pstate_get_balanced_epp() and amd_pstate_set_epp(), which dereference it unconditionally. A racing CPU hotplug or driver teardown can therefore lead to a NULL pointer dereference on either of these dynamic EPP paths. The third cpufreq_cpu_get() caller in this file, amd_pstate_verify(), already handles the NULL case. Bring the two new callers in line with that pattern: return NOTIFY_OK from the power-supply notifier (matching the other "nothing to do" exits) and -ENODEV from amd_pstate_profile_set() (the usual cpufreq error for a missing CPU policy). Found by code inspection; not tested on hardware.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/70c8c8b50d80f681f…
https://git.kernel.org/stable/c/f4ade8d224756ab69…
https://git.kernel.org/stable/c/39c0cf62fc7851a17…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 471d6659925aa0dcb4ab2520fa5ee3f49dfeab22 , < 70c8c8b50d80f681f50ddcc66a9400dd87508913 (git) Affected: e30ca6dd5345c5b8ba05f346a8e81105352fe571 , < f4ade8d224756ab69f108204dde6777bac4664e4 (git) Affected: e30ca6dd5345c5b8ba05f346a8e81105352fe571 , < 39c0cf62fc7851a17782e7efe8dfb2948739c681 (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/amd-pstate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "70c8c8b50d80f681f50ddcc66a9400dd87508913",
              "status": "affected",
              "version": "471d6659925aa0dcb4ab2520fa5ee3f49dfeab22",
              "versionType": "git"
            },
            {
              "lessThan": "f4ade8d224756ab69f108204dde6777bac4664e4",
              "status": "affected",
              "version": "e30ca6dd5345c5b8ba05f346a8e81105352fe571",
              "versionType": "git"
            },
            {
              "lessThan": "39c0cf62fc7851a17782e7efe8dfb2948739c681",
              "status": "affected",
              "version": "e30ca6dd5345c5b8ba05f346a8e81105352fe571",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/amd-pstate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks\n\ncpufreq_cpu_get() returns NULL when no cpufreq policy is associated with\nthe requested CPU, for example because the CPU is offline or the policy\nhas already been torn down.  Both amd_pstate_power_supply_notifier() and\namd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then\npass that pointer to amd_pstate_get_balanced_epp() and\namd_pstate_set_epp(), which dereference it unconditionally.  A racing\nCPU hotplug or driver teardown can therefore lead to a NULL pointer\ndereference on either of these dynamic EPP paths.\n\nThe third cpufreq_cpu_get() caller in this file, amd_pstate_verify(),\nalready handles the NULL case.  Bring the two new callers in line with\nthat pattern: return NOTIFY_OK from the power-supply notifier (matching\nthe other \"nothing to do\" exits) and -ENODEV from amd_pstate_profile_set()\n(the usual cpufreq error for a missing CPU policy).\n\nFound by code inspection; not tested on hardware."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:10:07.957Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/f4ade8d224756ab69f108204dde6777bac4664e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/39c0cf62fc7851a17782e7efe8dfb2948739c681"
        }
      ],
      "title": "cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92492",
    "datePublished": "2026-09-17T16:10:07.957Z",
    "dateReserved": "2026-09-16T12:21:13.871Z",
    "dateUpdated": "2026-09-17T16:10:07.957Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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.

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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.
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GHSA-2X57-5MR8-CJXJ

CVE-2026-92492 (GCVE-0-2026-92492)

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