CVE-2026-93150 (GCVE-0-2026-93150)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-21 12:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: Make nr_deadline_tasks an atomic_t The nr_deadline_tasks variable in the cpuset structure was introduced by commit 6c24849f5515 ("sched/cpuset: Keep track of SCHED_DEADLINE task in cpusets"). It is reported by sashiko [1] that nr_deadline_tasks can currently be modified by inc_dl_tasks_cs() under rq->lock and by cpuset_attach() under cpuset_mutex. So if both updates happen simultaneously, the nr_deadline_tasks variable can be corrupted leading to incorrect operations down the road. Fix that by changing its type to atomic_t so that nr_deadline_tasks are always atomically updated. This fix patch is a low hanging fruit. It can handle some of the races between a concurrent sched_setscheduler() and cpuset_can_attach()/cpuset_attach() calls, but not all of them like the other issue raised by sashiko [2]. This will be handled hopefully in a future follow up patch. [1] https://sashiko.dev/#/patchset/20260626181923.133658-1-longman%40redhat.com [2] https://sashiko.dev/#/patchset/20260630033344.352702-1-longman%40redhat.com
References
Impacted products
Vendor Product Version
Linux Linux Version: 6c24849f5515e4966d94fa5279bdff4acf2e9489
Version: 6c24849f5515e4966d94fa5279bdff4acf2e9489
Version: 6c24849f5515e4966d94fa5279bdff4acf2e9489
Version: 6c24849f5515e4966d94fa5279bdff4acf2e9489
Version: 6c24849f5515e4966d94fa5279bdff4acf2e9489
Version: 5ac05ce5684315d0e71194a63febaf33921c3268
Version: 43d8cbfefa7c59bd3b5fe184535eca476d45304e
Version: d1b4262b78cc7638642833252ae92fc586854ffb
Version: 74fac5bb0d375d6b8f5e7997925063c509089c9c
Version: 5.10.193   ≤
Version: 5.15.129   ≤
Version: 6.1.50   ≤
Version: 6.4.13   ≤
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{
  "containers": {
    "cna": {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: Make nr_deadline_tasks an atomic_t\n\nThe nr_deadline_tasks variable in the cpuset structure was introduced by\ncommit 6c24849f5515 (\"sched/cpuset: Keep track of SCHED_DEADLINE task\nin cpusets\"). It is reported by sashiko [1] that nr_deadline_tasks\ncan currently be modified by inc_dl_tasks_cs() under rq-\u003elock and\nby cpuset_attach() under cpuset_mutex. So if both updates happen\nsimultaneously, the nr_deadline_tasks variable can be corrupted leading\nto incorrect operations down the road.\n\nFix that by changing its type to atomic_t so that nr_deadline_tasks\nare always atomically updated. This fix patch is a low hanging fruit.\nIt can handle some of the races between a concurrent sched_setscheduler()\nand cpuset_can_attach()/cpuset_attach() calls, but not all of them like\nthe other issue raised by sashiko [2]. This will be handled hopefully\nin a future follow up patch.\n\n[1] https://sashiko.dev/#/patchset/20260626181923.133658-1-longman%40redhat.com\n[2] https://sashiko.dev/#/patchset/20260630033344.352702-1-longman%40redhat.com"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:52:05.398Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/642648fa7595241e4d491add5007bc33f11defb5"
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        {
          "url": "https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb"
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        {
          "url": "https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565"
        },
        {
          "url": "https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82"
        }
      ],
      "title": "cgroup/cpuset: Make nr_deadline_tasks an atomic_t",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93150",
    "datePublished": "2026-09-17T16:11:46.799Z",
    "dateReserved": "2026-09-17T16:02:15.089Z",
    "dateUpdated": "2026-10-21T12:52:05.398Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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