CVE-2025-21767 (GCVE-0-2025-21767)
Vulnerability from cvelistv5
Published
2025-02-27 02:18
Modified
2025-05-04 13:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context The following bug report happened with a PREEMPT_RT kernel: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2012, name: kwatchdog preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 get_random_u32+0x4f/0x110 clocksource_verify_choose_cpus+0xab/0x1a0 clocksource_verify_percpu.part.0+0x6b/0x330 clocksource_watchdog_kthread+0x193/0x1a0 It is due to the fact that clocksource_verify_choose_cpus() is invoked with preemption disabled. This function invokes get_random_u32() to obtain random numbers for choosing CPUs. The batched_entropy_32 local lock and/or the base_crng.lock spinlock in driver/char/random.c will be acquired during the call. In PREEMPT_RT kernel, they are both sleeping locks and so cannot be acquired in atomic context. Fix this problem by using migrate_disable() to allow smp_processor_id() to be reliably used without introducing atomic context. preempt_disable() is then called after clocksource_verify_choose_cpus() but before the clocksource measurement is being run to avoid introducing unexpected latency.
Impacted products
Vendor Product Version
Linux Linux Version: d9b40ebd448e437ffbc65f013836f98252279a82
Version: 7560c02bdffb7c52d1457fa551b9e745d4b9e754
Version: 7560c02bdffb7c52d1457fa551b9e745d4b9e754
Version: 7560c02bdffb7c52d1457fa551b9e745d4b9e754
Version: 7560c02bdffb7c52d1457fa551b9e745d4b9e754
Version: 7560c02bdffb7c52d1457fa551b9e745d4b9e754
Version: 7560c02bdffb7c52d1457fa551b9e745d4b9e754
Version: 193e14e68e907b2a7a936a7726accbaa4df25a4d
Version: 155d3c5d24ee13cafa6236b49fc02b240a511d59
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/time/clocksource.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d9c217fadfcff7a8df58567517d1e4253f3fd243",
              "status": "affected",
              "version": "d9b40ebd448e437ffbc65f013836f98252279a82",
              "versionType": "git"
            },
            {
              "lessThan": "60f54f0d4ea530950549a8263e6fdd70a40490a4",
              "status": "affected",
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "versionType": "git"
            },
            {
              "lessThan": "852805b6cbdb69c298a8fc9fbe79994c95106e04",
              "status": "affected",
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "versionType": "git"
            },
            {
              "lessThan": "8783ceeee797d9aa9cfe150690fb9d0bac8cc459",
              "status": "affected",
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "versionType": "git"
            },
            {
              "lessThan": "cc3d79e7c806cb57d71c28a4a35e7d7fb3265faa",
              "status": "affected",
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "versionType": "git"
            },
            {
              "lessThan": "0fb534187d2355f6c8f995321e76d1ccd1262ac1",
              "status": "affected",
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "versionType": "git"
            },
            {
              "lessThan": "6bb05a33337b2c842373857b63de5c9bf1ae2a09",
              "status": "affected",
              "version": "7560c02bdffb7c52d1457fa551b9e745d4b9e754",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "193e14e68e907b2a7a936a7726accbaa4df25a4d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "155d3c5d24ee13cafa6236b49fc02b240a511d59",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/time/clocksource.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.235",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.179",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.129",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.79",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.235",
                  "versionStartIncluding": "5.10.50",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.179",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.129",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.79",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.16",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.4",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.12.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.13.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T13:06:30.777Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d9c217fadfcff7a8df58567517d1e4253f3fd243"
        },
        {
          "url": "https://git.kernel.org/stable/c/60f54f0d4ea530950549a8263e6fdd70a40490a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/852805b6cbdb69c298a8fc9fbe79994c95106e04"
        },
        {
          "url": "https://git.kernel.org/stable/c/8783ceeee797d9aa9cfe150690fb9d0bac8cc459"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc3d79e7c806cb57d71c28a4a35e7d7fb3265faa"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fb534187d2355f6c8f995321e76d1ccd1262ac1"
        },
        {
          "url": "https://git.kernel.org/stable/c/6bb05a33337b2c842373857b63de5c9bf1ae2a09"
        }
      ],
      "title": "clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21767",
    "datePublished": "2025-02-27T02:18:17.067Z",
    "dateReserved": "2024-12-29T08:45:45.762Z",
    "dateUpdated": "2025-05-04T13:06:30.777Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21767\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T03:15:17.383\",\"lastModified\":\"2025-03-13T13:15:53.937\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: clocksource: Use migrants_disable() para evitar llamar a get_random_u32() en un contexto at\u00f3mico El siguiente informe de error ocurri\u00f3 con un kernel PREEMPT_RT: ERROR: funci\u00f3n inactiva llamada desde un contexto no v\u00e1lido en kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2012, name: kwatchdog preempt_count: 1, expected: 0 Profundidad de anidamiento de RCU: 0, expected: 0 get_random_u32+0x4f/0x110 clocksource_verify_choose_cpus+0xab/0x1a0 clocksource_verify_percpu.part.0+0x6b/0x330 clocksource_watchdog_kthread+0x193/0x1a0 Esto se debe al hecho de que clocksource_verify_choose_cpus() se invoca con la preempci\u00f3n deshabilitada. Esta funci\u00f3n invoca get_random_u32() para obtener n\u00fameros aleatorios para elegir las CPU. El bloqueo local batched_entropy_32 y/o el spinlock base_crng.lock en driver/char/random.c se adquirir\u00e1n durante la llamada. En el kernel PREEMPT_RT, ambos son bloqueos inactivos y, por lo tanto, no se pueden adquirir en un contexto at\u00f3mico. Solucione este problema utilizando migrants_disable() para permitir que smp_processor_id() se utilice de manera confiable sin introducir un contexto at\u00f3mico. Luego, se llama a preempt_disable() despu\u00e9s de clocksource_verify_choose_cpus() pero antes de que se ejecute la medici\u00f3n de la fuente de reloj para evitar introducir una latencia inesperada.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0fb534187d2355f6c8f995321e76d1ccd1262ac1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60f54f0d4ea530950549a8263e6fdd70a40490a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bb05a33337b2c842373857b63de5c9bf1ae2a09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/852805b6cbdb69c298a8fc9fbe79994c95106e04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8783ceeee797d9aa9cfe150690fb9d0bac8cc459\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc3d79e7c806cb57d71c28a4a35e7d7fb3265faa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d9c217fadfcff7a8df58567517d1e4253f3fd243\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


Loading…

Loading…