{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-21767",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21767",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-02-27T02:18:17.067Z",
    "updatedAt": "2026-10-15T01:04:16.407Z",
    "importedAt": "2026-10-24T01:57:29.455Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context\n\nThe following bug report happened with a PREEMPT_RT kernel:\n\n  BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2012, name: kwatchdog\n  preempt_count: 1, expected: 0\n  RCU nest depth: 0, expected: 0\n  get_random_u32+0x4f/0x110\n  clocksource_verify_choose_cpus+0xab/0x1a0\n  clocksource_verify_percpu.part.0+0x6b/0x330\n  clocksource_watchdog_kthread+0x193/0x1a0\n\nIt is due to the fact that clocksource_verify_choose_cpus() is invoked with\npreemption disabled.  This function invokes get_random_u32() to obtain\nrandom numbers for choosing CPUs.  The batched_entropy_32 local lock and/or\nthe base_crng.lock spinlock in driver/char/random.c will be acquired during\nthe call. In PREEMPT_RT kernel, they are both sleeping locks and so cannot\nbe acquired in atomic context.\n\nFix this problem by using migrate_disable() to allow smp_processor_id() to\nbe reliably used without introducing atomic context. preempt_disable() is\nthen called after clocksource_verify_choose_cpus() but before the\nclocksource measurement is being run to avoid introducing unexpected\nlatency.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d9b40ebd448e437ffbc65f013836f98252279a82",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d9c217fadfcff7a8df58567517d1e4253f3fd243"
            },
            {
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "status": "affected",
              "versionType": "git",
              "lessThan": "60f54f0d4ea530950549a8263e6fdd70a40490a4"
            },
            {
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "status": "affected",
              "versionType": "git",
              "lessThan": "852805b6cbdb69c298a8fc9fbe79994c95106e04"
            },
            {
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8783ceeee797d9aa9cfe150690fb9d0bac8cc459"
            },
            {
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cc3d79e7c806cb57d71c28a4a35e7d7fb3265faa"
            },
            {
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0fb534187d2355f6c8f995321e76d1ccd1262ac1"
            },
            {
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6bb05a33337b2c842373857b63de5c9bf1ae2a09"
            },
            {
              "version": "193e14e68e907b2a7a936a7726accbaa4df25a4d",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "155d3c5d24ee13cafa6236b49fc02b240a511d59",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.10.50",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.235"
            },
            {
              "version": "5.12.17",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.13"
            },
            {
              "version": "5.13.2",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.14"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.14",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.14"
            },
            {
              "version": "5.10.235",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.179",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.129",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.79",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.16",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "version": "6.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}