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FKIE_CVE-2026-93150

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/cgroup/cpuset-internal.h",
            "kernel/cgroup/cpuset.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e422b32e6a57269ca8164c60674a78bee85cf5fb",
              "status": "affected",
              "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
              "versionType": "git"
            },
            {
              "lessThan": "e5965ae3f7c918151b87e5c925b7978afbeaf638",
              "status": "affected",
              "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
              "versionType": "git"
            },
            {
              "lessThan": "78d9daf5e13ad1448b7dfebac949936710ec7565",
              "status": "affected",
              "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
              "versionType": "git"
            },
            {
              "lessThan": "95220e1f18f6321008f021abc7d6f581f64bcb82",
              "status": "affected",
              "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5ac05ce5684315d0e71194a63febaf33921c3268",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "43d8cbfefa7c59bd3b5fe184535eca476d45304e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d1b4262b78cc7638642833252ae92fc586854ffb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "74fac5bb0d375d6b8f5e7997925063c509089c9c",
              "versionType": "git"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.193",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.129",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.50",
              "versionType": "semver"
            },
            {
              "lessThan": "6.5",
              "status": "affected",
              "version": "6.4.13",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/cgroup/cpuset-internal.h",
            "kernel/cgroup/cpuset.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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"
    }
  ],
  "id": "CVE-2026-93150",
  "lastModified": "2026-09-17T17:18:10.213",
  "metrics": {},
  "published": "2026-09-17T17:18:10.213",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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