{"id":"CVE-2026-46017","state":"PUBLISHED","title":"mm: fix deferred split queue races during migration","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: fix deferred split queue races during migration\n\nmigrate_folio_move() records the deferred split queue state from src and\nreplays it on dst.  Replaying it after remove_migration_ptes(src, dst, 0)\nmakes dst visible before it is requeued, so a concurrent rmap-removal path\ncan mark dst partially mapped and trip the WARN in deferred_split_folio().\n\nMove the requeue before remove_migration_ptes() so dst is back on the\ndeferred split queue before it becomes visible again.\n\nBecause migration still holds dst locked at that point, teach\ndeferred_split_scan() to requeue a folio when folio_trylock() fails. \nOtherwise a fully mapped underused folio can be dequeued by the shrinker\nand silently lost from split_queue.\n\n[ziy@nvidia.com: move the comment]","publishedAt":"2026-05-27T12:56:18.800Z","updatedAt":"2026-06-14T17:48:14.283Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"3bac01168982ec3e3bf87efdc1807c7933590a85","versionType":"git"},{"version":"0","status":"affected","lessThan":"7.0.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/huge_memory.c","mm/migrate.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/huge_memory.c","mm/migrate.c"]}],"references":["https://git.kernel.org/stable/c/cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa","https://git.kernel.org/stable/c/3bac01168982ec3e3bf87efdc1807c7933590a85"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46017.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46017","state":"PUBLISHED","datePublished":"2026-05-27T12:56:18.800Z","dateUpdated":"2026-06-14T17:48:14.283Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.092Z"},"containers":{"cna":{"title":"mm: fix deferred split queue races during migration","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: fix deferred split queue races during migration\n\nmigrate_folio_move() records the deferred split queue state from src and\nreplays it on dst.  Replaying it after remove_migration_ptes(src, dst, 0)\nmakes dst visible before it is requeued, so a concurrent rmap-removal path\ncan mark dst partially mapped and trip the WARN in deferred_split_folio().\n\nMove the requeue before remove_migration_ptes() so dst is back on the\ndeferred split queue before it becomes visible again.\n\nBecause migration still holds dst locked at that point, teach\ndeferred_split_scan() to requeue a folio when folio_trylock() fails. \nOtherwise a fully mapped underused folio can be dequeued by the shrinker\nand silently lost from split_queue.\n\n[ziy@nvidia.com: move the comment]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"3bac01168982ec3e3bf87efdc1807c7933590a85","versionType":"git"},{"version":"0","status":"affected","lessThan":"7.0.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/huge_memory.c","mm/migrate.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/huge_memory.c","mm/migrate.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cbf75cf212ee6e499abc1757fb4b5ae6d70ed0aa"},{"url":"https://git.kernel.org/stable/c/3bac01168982ec3e3bf87efdc1807c7933590a85"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T17:48:14.283Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}