cpufreq: intel_pstate: Fix crash during turbo disable

{
  "id": "1b2ec8408a6885e03a432c9cbb189968c0fcb8feb36f4e7d41865fd3dd8879fd",
  "url": "https://osv.dev/vulnerability/CVE-2026-23332",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cpufreq: intel_pstate: Fix crash during turbo disable",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cpufreq: intel_pstate: Fix crash during turbo disable When the system is booted with kernel command line argument \"nosmt\" or \"maxcpus\" to limit the number of CPUs, disabling turbo via: echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo results in a crash: PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI ... RIP: 0010:store_no_turbo+0x100/0x1f0 ... This occurs because for_each_possible_cpu() returns CPUs even if they are not online. For those CPUs, all_cpu_data[] will be NULL. Since commit 973207ae3d7c (\"cpufreq: intel_pstate: Rearrange max frequency updates handling code\"), all_cpu_data[] is dereferenced even for CPUs which are not online, causing the NULL pointer dereference. To fix that, pass CPU number to intel_pstate_update_max_freq() and use all_cpu_data[] for those CPUs for which there is a valid cpufreq policy.",
    "evidence": "osv:CVE-2026-23332",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23332",
      "aliases": [
        "CVE-2026-23332"
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "a1850e2aef4d15405e7ff53fd51c4b3124d46182"
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                {
                  "fixed": "d20d48916ce8531b157c2edeba76d69af2974270"
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                  "fixed": "6b050482ec40569429d963ac52afa878691b04c9"
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          "database_specific": {
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.17"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.19.0"
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                {
                  "fixed": "6.19.7"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23332.json"
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        }
      ],
      "modified": "2026-10-28T02:30:39.555621659Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6b050482ec40569429d963ac52afa878691b04c9",
        "https://git.kernel.org/stable/c/a1850e2aef4d15405e7ff53fd51c4b3124d46182",
        "https://git.kernel.org/stable/c/d20d48916ce8531b157c2edeba76d69af2974270",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23332.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23332",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23332.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23332",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 506899,
  "published_at": "2026-03-25T10:27:23.193+00:00"
}