Vulnerability-Lookup

CVE-2026-43401 (GCVE-0-2026-43401)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-08 14:21

Title

cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()

Summary

In the Linux kernel, the following vulnerability has been resolved: cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request() The update_cpu_qos_request() function attempts to initialize the 'freq' variable by dereferencing 'cpudata' before verifying if the 'policy' is valid. This issue occurs on systems booted with the "nosmt" parameter, where all_cpu_data[cpu] is NULL for the SMT sibling threads. As a result, any call to update_qos_requests() will result in a NULL pointer dereference as the code will attempt to access pstate.turbo_freq using the NULL cpudata pointer. Also, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap() after initializing the 'freq' variable, so it is better to defer the 'freq' until intel_pstate_get_hwp_cap() has been called. Fix this by deferring the 'freq' assignment until after the policy and driver_data have been validated. [ rjw: Added one paragraph to the changelog ]

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/6bfda7ce56e7d14a6…
	https://git.kernel.org/stable/c/42738dffb7b0766a4…
	https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2…

Impacted products

Vendor

Product

Version

Linux

Affected: ae1bdd23b99f64335c69d546bff99ca39b894c18 , < 6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88 (git)
Affected: ae1bdd23b99f64335c69d546bff99ca39b894c18 , < 42738dffb7b0766a45882dff7989401d78f66f92 (git)
Affected: ae1bdd23b99f64335c69d546bff99ca39b894c18 , < ab39cc4cb8ceecdc2b61747433e7237f1ac2b789 (git)

Linux

Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/intel_pstate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88",
              "status": "affected",
              "version": "ae1bdd23b99f64335c69d546bff99ca39b894c18",
              "versionType": "git"
            },
            {
              "lessThan": "42738dffb7b0766a45882dff7989401d78f66f92",
              "status": "affected",
              "version": "ae1bdd23b99f64335c69d546bff99ca39b894c18",
              "versionType": "git"
            },
            {
              "lessThan": "ab39cc4cb8ceecdc2b61747433e7237f1ac2b789",
              "status": "affected",
              "version": "ae1bdd23b99f64335c69d546bff99ca39b894c18",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/intel_pstate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.19",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.9",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()\n\nThe update_cpu_qos_request() function attempts to initialize the \u0027freq\u0027\nvariable by dereferencing \u0027cpudata\u0027 before verifying if the \u0027policy\u0027\nis valid.\n\nThis issue occurs on systems booted with the \"nosmt\" parameter, where\nall_cpu_data[cpu] is NULL for the SMT sibling threads. As a result,\nany call to update_qos_requests() will result in a NULL pointer\ndereference as the code will attempt to access pstate.turbo_freq using\nthe NULL cpudata pointer.\n\nAlso, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap()\nafter initializing the \u0027freq\u0027 variable, so it is better to defer the\n\u0027freq\u0027 until intel_pstate_get_hwp_cap() has been called.\n\nFix this by deferring the \u0027freq\u0027 assignment until after the policy and\ndriver_data have been validated.\n\n[ rjw: Added one paragraph to the changelog ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T14:21:42.876Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88"
        },
        {
          "url": "https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789"
        }
      ],
      "title": "cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43401",
    "datePublished": "2026-05-08T14:21:42.876Z",
    "dateReserved": "2026-05-01T14:12:56.007Z",
    "dateUpdated": "2026-05-08T14:21:42.876Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43401",
      "date": "2026-05-09",
      "epss": "0.00017",
      "percentile": "0.04127"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43401\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T15:16:51.543\",\"lastModified\":\"2026-05-08T15:16:51.543\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()\\n\\nThe update_cpu_qos_request() function attempts to initialize the \u0027freq\u0027\\nvariable by dereferencing \u0027cpudata\u0027 before verifying if the \u0027policy\u0027\\nis valid.\\n\\nThis issue occurs on systems booted with the \\\"nosmt\\\" parameter, where\\nall_cpu_data[cpu] is NULL for the SMT sibling threads. As a result,\\nany call to update_qos_requests() will result in a NULL pointer\\ndereference as the code will attempt to access pstate.turbo_freq using\\nthe NULL cpudata pointer.\\n\\nAlso, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap()\\nafter initializing the \u0027freq\u0027 variable, so it is better to defer the\\n\u0027freq\u0027 until intel_pstate_get_hwp_cap() has been called.\\n\\nFix this by deferring the \u0027freq\u0027 assignment until after the policy and\\ndriver_data have been validated.\\n\\n[ rjw: Added one paragraph to the changelog ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-43401

Vulnerability from fkie_nvd - Published: 2026-05-08 15:16 - Updated: 2026-05-08 15:16

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()\n\nThe update_cpu_qos_request() function attempts to initialize the \u0027freq\u0027\nvariable by dereferencing \u0027cpudata\u0027 before verifying if the \u0027policy\u0027\nis valid.\n\nThis issue occurs on systems booted with the \"nosmt\" parameter, where\nall_cpu_data[cpu] is NULL for the SMT sibling threads. As a result,\nany call to update_qos_requests() will result in a NULL pointer\ndereference as the code will attempt to access pstate.turbo_freq using\nthe NULL cpudata pointer.\n\nAlso, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap()\nafter initializing the \u0027freq\u0027 variable, so it is better to defer the\n\u0027freq\u0027 until intel_pstate_get_hwp_cap() has been called.\n\nFix this by deferring the \u0027freq\u0027 assignment until after the policy and\ndriver_data have been validated.\n\n[ rjw: Added one paragraph to the changelog ]"
    }
  ],
  "id": "CVE-2026-43401",
  "lastModified": "2026-05-08T15:16:51.543",
  "metrics": {},
  "published": "2026-05-08T15:16:51.543",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-J7HX-VP8G-C83P

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-08 15:31

Details

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

cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()

The update_cpu_qos_request() function attempts to initialize the 'freq' variable by dereferencing 'cpudata' before verifying if the 'policy' is valid.

This issue occurs on systems booted with the "nosmt" parameter, where all_cpu_data[cpu] is NULL for the SMT sibling threads. As a result, any call to update_qos_requests() will result in a NULL pointer dereference as the code will attempt to access pstate.turbo_freq using the NULL cpudata pointer.

Also, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap() after initializing the 'freq' variable, so it is better to defer the 'freq' until intel_pstate_get_hwp_cap() has been called.

Fix this by deferring the 'freq' assignment until after the policy and driver_data have been validated.

[ rjw: Added one paragraph to the changelog ]

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-43401"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T15:16:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()\n\nThe update_cpu_qos_request() function attempts to initialize the \u0027freq\u0027\nvariable by dereferencing \u0027cpudata\u0027 before verifying if the \u0027policy\u0027\nis valid.\n\nThis issue occurs on systems booted with the \"nosmt\" parameter, where\nall_cpu_data[cpu] is NULL for the SMT sibling threads. As a result,\nany call to update_qos_requests() will result in a NULL pointer\ndereference as the code will attempt to access pstate.turbo_freq using\nthe NULL cpudata pointer.\n\nAlso, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap()\nafter initializing the \u0027freq\u0027 variable, so it is better to defer the\n\u0027freq\u0027 until intel_pstate_get_hwp_cap() has been called.\n\nFix this by deferring the \u0027freq\u0027 assignment until after the policy and\ndriver_data have been validated.\n\n[ rjw: Added one paragraph to the changelog ]",
  "id": "GHSA-j7hx-vp8g-c83p",
  "modified": "2026-05-08T15:31:27Z",
  "published": "2026-05-08T15:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43401"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789"
    }
  ],
  "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.

Action not permitted

CVE-2026-43401 (GCVE-0-2026-43401)

FKIE_CVE-2026-43401

GHSA-J7HX-VP8G-C83P

Tags

Sightings

Nomenclature