{"id":"CVE-2025-38686","state":"PUBLISHED","title":"userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry\n\nWhen UFFDIO_MOVE encounters a migration PMD entry, it proceeds with\nobtaining a folio and accessing it even though the entry is swp_entry_t. \nAdd the missing check and let split_huge_pmd() handle migration entries. \nWhile at it also remove unnecessary folio check.\n\n[surenb@google.com: remove extra folio check, per David]","publishedAt":"2025-09-04T15:32:40.771Z","updatedAt":"2026-05-11T21:33:01.310Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"bb81c18dbd42650c844e160cafa7cbb20243a96a","versionType":"git"},{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"1202abad7a7ccd28c426d2844771a387b07629a4","versionType":"git"},{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"7f1101a0a181243ad587ececdffc4845f035549f","versionType":"git"},{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"aba6faec0103ed8f169be8dce2ead41fcb689446","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/userfaultfd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.43","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.11","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16.2","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/userfaultfd.c"]}],"references":["https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a","https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4","https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f","https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38686.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38686","state":"PUBLISHED","datePublished":"2025-09-04T15:32:40.771Z","dateUpdated":"2026-05-11T21:33:01.310Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:24.032Z"},"containers":{"cna":{"title":"userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry\n\nWhen UFFDIO_MOVE encounters a migration PMD entry, it proceeds with\nobtaining a folio and accessing it even though the entry is swp_entry_t. \nAdd the missing check and let split_huge_pmd() handle migration entries. \nWhile at it also remove unnecessary folio check.\n\n[surenb@google.com: remove extra folio check, per David]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"bb81c18dbd42650c844e160cafa7cbb20243a96a","versionType":"git"},{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"1202abad7a7ccd28c426d2844771a387b07629a4","versionType":"git"},{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"7f1101a0a181243ad587ececdffc4845f035549f","versionType":"git"},{"version":"adef440691bab824e39c1b17382322d195e1fab0","status":"affected","lessThan":"aba6faec0103ed8f169be8dce2ead41fcb689446","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/userfaultfd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.43","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.11","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16.2","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/userfaultfd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a"},{"url":"https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4"},{"url":"https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f"},{"url":"https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:33:01.310Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.43"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.15.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.16.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.17"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}