{"id":"CVE-2026-98418","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.","modified":"2026-10-15T02:47:34.925866934Z","published":"2026-10-14T13:27:48.406Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98418.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e4a442da49fff7619b3cb2988e477022dcea6688"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fe3c73d7bc769e7afc252f867a3421fe168b898d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98418.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98418"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b049b81bdff6fc6794200a4c7d7d910e2008d57f"},{"fixed":"e4a442da49fff7619b3cb2988e477022dcea6688"},{"fixed":"fe3c73d7bc769e7afc252f867a3421fe168b898d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98418.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98418.json"}}],"schema_version":"1.9.0"}