{"id":"CVE-2026-93150","state":"PUBLISHED","title":"cgroup/cpuset: Make nr_deadline_tasks an atomic_t","description":"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->lock 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","publishedAt":"2026-09-17T16:11:46.799Z","updatedAt":"2026-10-30T12:36:08.842Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1b4262b78cc7638642833252ae92fc586854ffb","status":"affected","lessThan":"4987d336abf3fa575a2d953f69e11154ac9802c3","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"642648fa7595241e4d491add5007bc33f11defb5","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"e422b32e6a57269ca8164c60674a78bee85cf5fb","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"e5965ae3f7c918151b87e5c925b7978afbeaf638","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"78d9daf5e13ad1448b7dfebac949936710ec7565","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"95220e1f18f6321008f021abc7d6f581f64bcb82","versionType":"git"},{"version":"5ac05ce5684315d0e71194a63febaf33921c3268","status":"affected","versionType":"git"},{"version":"43d8cbfefa7c59bd3b5fe184535eca476d45304e","status":"affected","versionType":"git"},{"version":"74fac5bb0d375d6b8f5e7997925063c509089c9c","status":"affected","versionType":"git"},{"version":"6.1.50","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"5.10.193","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.129","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.4.13","status":"affected","lessThan":"6.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset-internal.h","kernel/cgroup/cpuset.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset-internal.h","kernel/cgroup/cpuset.c"]}],"references":["https://git.kernel.org/stable/c/4987d336abf3fa575a2d953f69e11154ac9802c3","https://git.kernel.org/stable/c/642648fa7595241e4d491add5007bc33f11defb5","https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb","https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638","https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565","https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93150.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93150","state":"PUBLISHED","datePublished":"2026-09-17T16:11:46.799Z","dateUpdated":"2026-10-30T12:36:08.842Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.089Z"},"containers":{"cna":{"title":"cgroup/cpuset: Make nr_deadline_tasks an atomic_t","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->lock 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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1b4262b78cc7638642833252ae92fc586854ffb","status":"affected","lessThan":"4987d336abf3fa575a2d953f69e11154ac9802c3","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"642648fa7595241e4d491add5007bc33f11defb5","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"e422b32e6a57269ca8164c60674a78bee85cf5fb","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"e5965ae3f7c918151b87e5c925b7978afbeaf638","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"78d9daf5e13ad1448b7dfebac949936710ec7565","versionType":"git"},{"version":"6c24849f5515e4966d94fa5279bdff4acf2e9489","status":"affected","lessThan":"95220e1f18f6321008f021abc7d6f581f64bcb82","versionType":"git"},{"version":"5ac05ce5684315d0e71194a63febaf33921c3268","status":"affected","versionType":"git"},{"version":"43d8cbfefa7c59bd3b5fe184535eca476d45304e","status":"affected","versionType":"git"},{"version":"74fac5bb0d375d6b8f5e7997925063c509089c9c","status":"affected","versionType":"git"},{"version":"6.1.50","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"5.10.193","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.129","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.4.13","status":"affected","lessThan":"6.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset-internal.h","kernel/cgroup/cpuset.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/cpuset-internal.h","kernel/cgroup/cpuset.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4987d336abf3fa575a2d953f69e11154ac9802c3"},{"url":"https://git.kernel.org/stable/c/642648fa7595241e4d491add5007bc33f11defb5"},{"url":"https://git.kernel.org/stable/c/e422b32e6a57269ca8164c60674a78bee85cf5fb"},{"url":"https://git.kernel.org/stable/c/e5965ae3f7c918151b87e5c925b7978afbeaf638"},{"url":"https://git.kernel.org/stable/c/78d9daf5e13ad1448b7dfebac949936710ec7565"},{"url":"https://git.kernel.org/stable/c/95220e1f18f6321008f021abc7d6f581f64bcb82"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:36:08.842Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.50","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.193"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.129"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}