CVE-2024-27007

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This\navoids failure of swapout+migration and possibly memory corruption.\n\nHowever, the commit missed fixing it in the huge-page case."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only through the `UFFDIO_MOVE` ioctl on a local userfaultfd file descriptor obtained via the `userfaultfd(2)` syscall or `/dev/userfaultfd`, operating on the caller's own address space. There is no remote or adjacent-network path to `move_pages_huge_pmd()`.\nAC:L - The attacker controls both sides of the race, looping `UFFDIO_MOVE` in one thread against `pin_user_pages_fast()` (io_uring buffer registration, vmsplice, O_DIRECT) in another on the same attacker-owned THP, and all preconditions (two anon writable VMAs, uffd registration, `MADV_HUGEPAGE`) are self-supplied. Losing an attempt costs nothing but an `-EBUSY`, so the race can be retried indefinitely until won.\nPR:L - Any unprivileged local user can obtain the context \u2014 `userfaultfd_syscall_allowed()` unconditionally permits `UFFD_USER_MODE_ONLY` irrespective of the `vm.unprivileged_userfaultfd` sysctl, and `/dev/userfaultfd` is ungated (world-usable on Android/ChromeOS, the primary `UFFDIO_MOVE` consumers). Neither `userfaultfd_move()` nor `validate_move_areas()` performs any capability check.\nUI:N - A single attacker process drives the entire sequence \u2014 allocate the THP, register the uffd, race `UFFDIO_MOVE` against a GUP pin, then `munmap()` the dst VMA. No victim action or cooperation is involved.\nS:U - The corrupted rmap metadata, the freed `anon_vma`, and any resulting escalation are all kernel objects within the same security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `folio->mapping` breaks the invariant asserted in `folio_get_anon_vma()` (`mm/rmap.c:518-524`), yielding a use-after-free on a `SLAB_TYPESAFE_BY_RCU` `anon_vma` that an attacker can groom and reuse; subsequent rmap walks operate on the wrong anon_vma/index, and the mis-indexed folio can be migrated or reclaimed into an unrelated mapping, exposing arbitrary memory contents.\nI:H - The dangling `anon_vma` gives an `atomic_inc_not_zero()` write into freed, attacker-reusable slab memory, and rmap operations mutate PTE state through the wrong anon_vma interval tree \u2014 both upstream commits explicitly state the invalid rmap \"possibly result[s] in memory corruption,\" which is leverageable for control-flow hijack.\nA:H - The use-after-free on the freed `anon_vma`, plus reachable `VM_BUG_ON` assertions in `__page_check_anon_rmap()` and the `split_huge_page`/migration paths, produce kernel oopses and panics. Swapout and migration of the affected folio also permanently fail because its mappings can no longer be located."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/huge_memory.c"], "versions": [{"version": "adef440691bab824e39c1b17382322d195e1fab0", "lessThan": "df5f6e683e7f21a15d8be6e7a0c7a46436963ebe", "status": "affected", "versionType": "git"}, {"version": "adef440691bab824e39c1b17382322d195e1fab0", "lessThan": "c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/huge_memory.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.8", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.8.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe"}, {"url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"}], "title": "userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-17T17:40:30.411881Z", "id": "CVE-2024-27007", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T17:46:11.249Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50", "tags": ["x_transferred"]}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T17:16:42.236Z"}}]}}

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There is no remote or adjacent-network path to `move_pages_huge_pmd()`.\nAC:L - The attacker controls both sides of the race, looping `UFFDIO_MOVE` in one thread against `pin_user_pages_fast()` (io_uring buffer registration, vmsplice, O_DIRECT) in another on the same attacker-owned THP, and all preconditions (two anon writable VMAs, uffd registration, `MADV_HUGEPAGE`) are self-supplied. Losing an attempt costs nothing but an `-EBUSY`, so the race can be retried indefinitely until won.\nPR:L - Any unprivileged local user can obtain the context \u2014 `userfaultfd_syscall_allowed()` unconditionally permits `UFFD_USER_MODE_ONLY` irrespective of the `vm.unprivileged_userfaultfd` sysctl, and `/dev/userfaultfd` is ungated (world-usable on Android/ChromeOS, the primary `UFFDIO_MOVE` consumers). Neither `userfaultfd_move()` nor `validate_move_areas()` performs any capability check.\nUI:N - A single attacker process drives the entire sequence \u2014 allocate the THP, register the uffd, race `UFFDIO_MOVE` against a GUP pin, then `munmap()` the dst VMA. No victim action or cooperation is involved.\nS:U - The corrupted rmap metadata, the freed `anon_vma`, and any resulting escalation are all kernel objects within the same security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `folio->mapping` breaks the invariant asserted in `folio_get_anon_vma()` (`mm/rmap.c:518-524`), yielding a use-after-free on a `SLAB_TYPESAFE_BY_RCU` `anon_vma` that an attacker can groom and reuse; subsequent rmap walks operate on the wrong anon_vma/index, and the mis-indexed folio can be migrated or reclaimed into an unrelated mapping, exposing arbitrary memory contents.\nI:H - The dangling `anon_vma` gives an `atomic_inc_not_zero()` write into freed, attacker-reusable slab memory, and rmap operations mutate PTE state through the wrong anon_vma interval tree \u2014 both upstream commits explicitly state the invalid rmap \"possibly result[s] in memory corruption,\" which is leverageable for control-flow hijack.\nA:H - The use-after-free on the freed `anon_vma`, plus reachable `VM_BUG_ON` assertions in `__page_check_anon_rmap()` and the `split_huge_page`/migration paths, produce kernel oopses and panics. Swapout and migration of the affected folio also permanently fail because its mappings can no longer be located."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "adef440691bab824e39c1b17382322d195e1fab0", "lessThan": "df5f6e683e7f21a15d8be6e7a0c7a46436963ebe", "versionType": "git"}, {"status": "affected", "version": "adef440691bab824e39c1b17382322d195e1fab0", "lessThan": "c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50", "versionType": "git"}], "programFiles": ["mm/huge_memory.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"status": "unaffected", "version": "0", "lessThan": "6.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.8.8", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/huge_memory.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe"}, {"url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE\n\nCommit d7a08838ab74 (\"mm: userfaultfd: fix unexpected change to src_folio\nwhen UFFDIO_MOVE fails\") moved the src_folio->{mapping, index} changing to\nafter clearing the page-table and ensuring that it's not pinned. This\navoids failure of swapout+migration and possibly memory corruption.\n\nHowever, the commit missed fixing it in the huge-page case."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.8", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "6.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:57.017Z"}}}, "cveMetadata": {"cveId": "CVE-2024-27007", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:28:57.017Z", "dateReserved": "2024-02-19T14:20:24.208Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-01T05:29:08.528Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/huge_memory.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "df5f6e683e7f21a15d8be6e7a0c7a46436963ebe", "status": "affected", "version": "adef440691bab824e39c1b17382322d195e1fab0", "versionType": "git"}, {"lessThan": "c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50", "status": "affected", "version": "adef440691bab824e39c1b17382322d195e1fab0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/huge_memory.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A6B3F478-AAC3-4675-897F-870080589B51", "versionEndExcluding": "6.8.8", "versionStartIncluding": "6.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*", "matchCriteriaId": "22BEDD49-2C6D-402D-9DBF-6646F6ECD10B", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*", "matchCriteriaId": "DF73CB2A-DFFD-46FB-9BFE-AA394F27EA37", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:*", "matchCriteriaId": "52048DDA-FC5A-4363-95A0-A6357B4D7F8C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*", "matchCriteriaId": "A06B2CCF-3F43-4FA9-8773-C83C3F5764B2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE\n\nCommit d7a08838ab74 (\"mm: userfaultfd: fix unexpected change to src_folio\nwhen UFFDIO_MOVE fails\") moved the src_folio->{mapping, index} changing to\nafter clearing the page-table and ensuring that it's not pinned. This\navoids failure of swapout+migration and possibly memory corruption.\n\nHowever, the commit missed fixing it in the huge-page case."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: userfaultfd: cambie src_folio despu\u00e9s de asegurarse de que no est\u00e9 fijado en UFFDIO_MOVE Commit d7a08838ab74 (\"mm: userfaultfd: corrija el cambio inesperado en src_folio cuando UFFDIO_MOVE falla\") movi\u00f3 src_folio->{mapping, index} cambiando a despu\u00e9s de borrar la tabla de p\u00e1ginas y asegurarse de que no est\u00e9 fijada. Esto evita fallos en el intercambio+migraci\u00f3n y posiblemente da\u00f1os en la memoria. Sin embargo, la confirmaci\u00f3n no solucion\u00f3 el problema en el caso de la p\u00e1gina enorme."}], "id": "CVE-2024-27007", "lastModified": "2026-08-04T11:17:32.830", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-27007", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-17T17:40:30.411881Z", "version": "2.0.3"}}]}, "published": "2024-05-01T06:15:19.180", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE", "id": "2278285", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2278285"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nuserfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE\nCommit d7a08838ab74 (\"mm: userfaultfd: fix unexpected change to src_folio\nwhen UFFDIO_MOVE fails\") moved the src_folio->{mapping, index} changing to\nafter clearing the page-table and ensuring that it's not pinned. This\navoids failure of swapout+migration and possibly memory corruption.\nHowever, the commit missed fixing it in the huge-page case."], "name": "CVE-2024-27007", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-27007\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-27007\nhttps://lore.kernel.org/linux-cve-announce/2024050147-CVE-2024-27007-686b@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:16:22.116931+00:00", "updated": "2025-07-12T22:16:22.117001+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}