{"schema":"threatline.record/2","record":{"id":"CVE-2026-98418","aliases":[],"summary":"sched/core: Avoid false migration warning for proxy donors","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Avoid false migration warning for proxy donors\n\nProxy execution can move a blocked donor's scheduling context to the\nlock owner's CPU even when the donor is migration-disabled. The donor\ndoes not execute there, and its original execution CPU remains recorded\nin wake_cpu.\n\nset_task_cpu() warns unconditionally for migration-disabled tasks, so a\nsubsequent proxy migration or the wakeup path returning the donor home\ntriggers a false positive: moving a blocked scheduling context does not\nviolate the migration-disabled execution context.\n\nFor example, creating a mutex owner on CPU1 and a migration-disabled\nwaiter on CPU0 can trigger the following warning:\n\n  proxy_migrate_repro: donor blocking on CPU0 with migration disabled\n  proxy_migrate_repro: donor moved from CPU0 to CPU1\n  WARNING: kernel/sched/core.c:3389 at set_task_cpu+0x1d3/0x280\n  ...\n  Call Trace:\n   try_to_wake_up+0x43f/0x780\n   __mutex_unlock_slowpath+0x330/0x540\n   owner_fn+0x9f/0xc0 [proxy_migrate_repro]\n  ...\n  proxy_migrate_repro: donor woke on CPU0, task_cpu=0\n  proxy_migrate_repro: completed\n\nExclude blocked proxy donors from the warning. The proxy wakeup path\nrestores an executable placement before clearing the blocked state.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98418","source_modified_at":"2026-10-19T09:19:11.970Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"b049b81bdff6fc6794200a4c7d7d910e2008d57f","lessThan":"e4a442da49fff7619b3cb2988e477022dcea6688","status":"affected","versionType":"git"},{"version":"b049b81bdff6fc6794200a4c7d7d910e2008d57f","lessThan":"fe3c73d7bc769e7afc252f867a3421fe168b898d","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98418","source_modified_at":"2026-10-19T09:19:11.970Z","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":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00216,"percentile":0.11445,"score_date":"2026-10-23"},"published_at":"2026-10-14T13:27:48.406Z","modified_at":"2026-10-19T09:19:11.970Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98418","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:19:11.970Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98418","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/e4a442da49fff7619b3cb2988e477022dcea6688"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fe3c73d7bc769e7afc252f867a3421fe168b898d"}],"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":"2026-10-19T09:19:11.970Z","content_hash":"dbfef929321e141eb08e1d57c891e9c474b7edf37087147230fa6a5424988226"}}