GHSA-RM22-RVMG-2466
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32In 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
{
"affected": [],
"aliases": [
"CVE-2026-93150"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:18:10Z",
"severity": null
},
"details": "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": "GHSA-rm22-rvmg-2466",
"modified": "2026-09-17T18:32:12Z",
"published": "2026-09-17T18:32:12Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93150"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638"
}
],
"schema_version": "1.4.0",
"severity": []
}
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