{"id":"CVE-2026-93217","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/madvise: skip device-private PMDs in cold and pageout walks\n\nmadvise_cold_or_pageout_pte_range() takes pmd_trans_huge_lock(), whose\npmd_is_huge() check returns true …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/madvise: skip device-private PMDs in cold and pageout walks\n\nmadvise_cold_or_pageout_pte_range() takes pmd_trans_huge_lock(), whose\npmd_is_huge() check returns true …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 368076f52ebeecd33e10a9f80905d7508b6b6149 < 5c0d7b658cda62cd17cb3652783386d5608030ef","Linux >= 368076f52ebeecd33e10a9f80905d7508b6b6149 < d4b76d0b03cb49611312ecc4bcfb55ccdf0843e2","Linux 6.19"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T16:17:16.790","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93217","references":[{"url":"https://git.kernel.org/stable/c/5c0d7b658cda62cd17cb3652783386d5608030ef","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d4b76d0b03cb49611312ecc4bcfb55ccdf0843e2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T15:45:56.669Z","slug":"CVE-2026-93217","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmm/madvise: skip device-private PMDs in cold and pageout walks\n\nmadvise_cold_or_pageout_pte_range() takes pmd_trans_huge_lock(), whose\npmd_is_huge() check returns true for a device-private PMD.  The subsequent\n!pmd_present() branch has a VM_BUG_ON() asserting migration is the only\nallowed non-present case; a device-private PMD trips it.\n\nSkip device-private PMDs in that non-present branch and continue to\nhuge_unlock before calling pmd_folio().  Downgrade the check to\nVM_WARN_ON_ONCE() so an unexpected PMD softleaf logs a warning rather than\npanicking.  Drop the thp_migration_supported() guard: it expands to\nIS_ENABLED(CONFIG_ARCH_SUPPORTS_PMD_SOFTLEAF), and both\npmd_is_migration_entry() and pmd_is_device_private_entry() already return\nfalse when that config is not selected, so the guard suppresses only the\ncase where the warning would already be silent.\n\nPotential trigger: an HMM-based GPU driver races with\nmadvise(MADV_COLD)/MADV_PAGEOUT: pmd_trans_huge(*pmd) reads true, then\nmigrate_vma_pages() flips the PMD to a device-private entry before the PMD\nlock is acquired.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}