{"id":"CVE-2026-93217","revision":"7b2a2277f49449a5aa87b068ec7ff353","records":[{"revision":"7b2a2277f49449a5aa87b068ec7ff353","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93217","aliases":[],"title":"mm/madvise: skip device-private PMDs in cold and pageout walks","description":"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 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.","state":0,"publishedAt":"2026-09-24T15:10:40.487+00:00","modifiedAt":"2026-10-19T09:07:29.053+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/madvise.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"368076f52ebeecd33e10a9f80905d7508b6b6149\",\n                            \"lessThan\": \"5c0d7b658cda62cd17cb3652783386d5608030ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"368076f52ebeecd33e10a9f80905d7508b6b6149\",\n                            \"lessThan\": \"d4b76d0b03cb49611312ecc4bcfb55ccdf0843e2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/madvise.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/5c0d7b658cda62cd17cb3652783386d5608030ef","https://git.kernel.org/stable/c/d4b76d0b03cb49611312ecc4bcfb55ccdf0843e2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93217","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93217","identifiers":["CVE-2026-93217"]},"retained":false,"historicalAffected":[]}],"coverage":[]}