{"id":"CVE-2024-36881","title":"mm/userfaultfd: reset ptes when close() for wr-protected ones","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/userfaultfd: reset ptes when close() for wr-protected ones\n\nUserfaultfd unregister includes a step to remove wr-protect bits from all\nthe relevant pgtable entries, b…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"adp","vendor":"Linux","product":"Linux","affected":["Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 1da0471de653b13c8f63dcd32a23574d683c8310","Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 377f3a9a3d032a52325a5b110379a25dd1ab1931","Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 8d8b68a5b0c9fb23d37df06bb273ead38fd5a29d","Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < c88033efe9a391e72ba6b5df4b01d6e628f4e734","Linux 3e2747c3ddfa717697c3cc2aa6ab989e48d6587d","Linux >= 5.19.6 < 5.20","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-05-31T18:32:07.483199Z"},"published":"2024-05-30","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:18:26.092Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-36881","references":[{"url":"https://git.kernel.org/stable/c/1da0471de653b13c8f63dcd32a23574d683c8310"},{"url":"https://git.kernel.org/stable/c/377f3a9a3d032a52325a5b110379a25dd1ab1931"},{"url":"https://git.kernel.org/stable/c/8d8b68a5b0c9fb23d37df06bb273ead38fd5a29d"},{"url":"https://git.kernel.org/stable/c/c88033efe9a391e72ba6b5df4b01d6e628f4e734"}],"tags":["cve.org"],"epss":0.00239,"epssPercentile":0.15028,"ingestedAt":"2026-11-03T12:44:28.815Z","slug":"CVE-2024-36881","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmm/userfaultfd: reset ptes when close() for wr-protected ones\n\nUserfaultfd unregister includes a step to remove wr-protect bits from all\nthe relevant pgtable entries, but that only covered an explicit\nUFFDIO_UNREGISTER ioctl, not a close() on the userfaultfd itself.  Cover\nthat too.  This fixes a WARN trace.\n\nThe only user visible side effect is the user can observe leftover\nwr-protect bits even if the user close()ed on an userfaultfd when\nreleasing the last reference of it.  However hopefully that should be\nharmless, and nothing bad should happen even if so.\n\nThis change is now more important after the recent page-table-check\npatch we merged in mm-unstable (446dd9ad37d0 (\"mm/page_table_check:\nsupport userfault wr-protect entries\")), as we'll do sanity check on\nuffd-wp bits without vma context.  So it's better if we can 100%\nguarantee no uffd-wp bit leftovers, to make sure each report will be\nvalid.\n\n## Affected\n\n- `Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 1da0471de653b13c8f63dcd32a23574d683c8310`\n- `Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 377f3a9a3d032a52325a5b110379a25dd1ab1931`\n- `Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 8d8b68a5b0c9fb23d37df06bb273ead38fd5a29d`\n- `Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < c88033efe9a391e72ba6b5df4b01d6e628f4e734`\n- `Linux 3e2747c3ddfa717697c3cc2aa6ab989e48d6587d`\n- `Linux >= 5.19.6 < 5.20`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}