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cgroup/cpuset: Make nr_deadline_tasks an atomic_t

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-93150

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93150

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
        "lessThan": "642648fa7595241e4d491add5007bc33f11defb5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
        "lessThan": "e422b32e6a57269ca8164c60674a78bee85cf5fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
        "lessThan": "e5965ae3f7c918151b87e5c925b7978afbeaf638",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6c24849f5515e4966d94fa5279bdff4acf2e9489",
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        "versionType": "git"
      },
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        "status": "affected",
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        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ac05ce5684315d0e71194a63febaf33921c3268",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "43d8cbfefa7c59bd3b5fe184535eca476d45304e",
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      },
      {
        "status": "affected",
        "version": "d1b4262b78cc7638642833252ae92fc586854ffb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "74fac5bb0d375d6b8f5e7997925063c509089c9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.193",
        "lessThan": "5.11",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.129",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.50",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.4.13",
        "lessThan": "6.5",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "kernel/cgroup/cpuset-internal.h",
      "kernel/cgroup/cpuset.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/cgroup/cpuset-internal.h",
      "kernel/cgroup/cpuset.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93150

Source reference: /cveMetadata/cveId

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Event
#48719 · Revision 1
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