CVE-2026-99058 (GCVE-0-2026-99058)
Vulnerability from cvelistv5
Published
2026-10-23 12:22
Modified
2026-10-30 12:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: workqueue: Fix NULL current_pwq deref in chained work check current_wq_worker() only tells us that %current is a kworker. It does not guarantee that the worker is currently executing a work item, as worker->current_pwq is populated only while process_one_work() is running the work function. is_chained_work() can be reached while queueing on a draining or destroying workqueue. If a kworker outside work-item execution reaches that path, current_wq_worker() returns a worker but worker->current_pwq is NULL, and the chained-work test can fault before it emits the intended warning. Guard the chained-work test with worker->current_pwq. A kworker without current_pwq is not executing work on the target workqueue, so the helper should return false and let the draining/destroying warning fire.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
Version: 8d03ecfe471802d6afe97da97722b6924533aa82
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix NULL current_pwq deref in chained work check\n\ncurrent_wq_worker() only tells us that %current is a kworker. It does\nnot guarantee that the worker is currently executing a work item, as\nworker-\u003ecurrent_pwq is populated only while process_one_work() is running\nthe work function.\n\nis_chained_work() can be reached while queueing on a draining or\ndestroying workqueue. If a kworker outside work-item execution reaches\nthat path, current_wq_worker() returns a worker but worker-\u003ecurrent_pwq is\nNULL, and the chained-work test can fault before it emits the intended\nwarning.\n\nGuard the chained-work test with worker-\u003ecurrent_pwq. A kworker without\ncurrent_pwq is not executing work on the target workqueue, so the helper\nshould return false and let the draining/destroying warning fire."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:24.511Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6877de2c75f0dd342099a1357856e6c8d474abc3"
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        {
          "url": "https://git.kernel.org/stable/c/54361e4924c2c52a501b74ef10217c32f45fccfa"
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        {
          "url": "https://git.kernel.org/stable/c/3dc61af2998cfc7312d6e59bbdcd5eed074483f2"
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        {
          "url": "https://git.kernel.org/stable/c/729d576df89c7e4341e58c452f8890620a610ac2"
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          "url": "https://git.kernel.org/stable/c/b12a25fb2b9d5dac80e419d695450cc17a51fdfd"
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          "url": "https://git.kernel.org/stable/c/1a2668682e998039a027796b236319b380078a6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/980db94e3eeefdd8a1c46f86412c33a7f7806f51"
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      "title": "workqueue: Fix NULL current_pwq deref in chained work check",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99058",
    "datePublished": "2026-10-23T12:22:45.920Z",
    "dateReserved": "2026-09-25T10:25:14.388Z",
    "dateUpdated": "2026-10-30T12:41:24.511Z",
    "state": "PUBLISHED"
  },
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}


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