{"schema":"threatline.record/2","record":{"id":"CVE-2026-98864","aliases":[],"summary":"sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task\n\nebf1ccff79c4 (\"sched_ext: Fix ops.dequeue() semantics\") moved the final\nops_state store in scx_dispatch_enqueue() after the DSQ unlock so that the\ncustody update and ops.dequeue() precede it. A task can thus be found on a\nDSQ while still SCX_OPSS_DISPATCHING.\n\nThe dequeue and core-sched pick paths wait for the state to clear in\nops_dequeue() but the reenqueue paths don't. A reenqueue in that window runs\nops.enqueue() and sets SCX_OPSS_QUEUED before the dispatch has completed.\nThe dispatcher's final store then overwrites it with SCX_OPSS_NONE and\nfinish_dispatch() drops every later dispatch of the task.\n\nWait for SCX_OPSS_DISPATCHING to clear before dequeueing a task for\nreenqueue, the same way ops_dequeue() does.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98864","source_modified_at":"2026-10-19T09:26:58.668Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d","lessThan":"43457bf6550044c40bd6d3fcdf9ea66f5a55d139","status":"affected","versionType":"git"},{"version":"ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d","lessThan":"7de9a6fb44eae4f05e68c805d58b9c618815adfa","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98864","source_modified_at":"2026-10-19T09:26:58.668Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"7.1","status":"affected"},{"version":"0","lessThan":"7.1","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98864","source_modified_at":"2026-10-19T09:26:58.668Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"43457bf6550044c40bd6d3fcdf9ea66f5a55d139","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98864","source_modified_at":"2026-10-19T09:26:58.668Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7de9a6fb44eae4f05e68c805d58b9c618815adfa","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00159,"percentile":0.04635,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:51:25.532Z","modified_at":"2026-10-19T09:26:58.668Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98864","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:26:58.668Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98864","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/43457bf6550044c40bd6d3fcdf9ea66f5a55d139"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7de9a6fb44eae4f05e68c805d58b9c618815adfa"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:26:58.668Z","content_hash":"0c7981b1870b4744dbe805340433ab6ab65e8bd36bd743c93686459ecd54ed27"}}