203 lines
11 KiB
JSON
203 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-27007",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.208Z",
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"datePublished": "2024-05-01T05:29:08.528Z",
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"dateUpdated": "2026-08-05T11:28:57.017Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:28:57.017Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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 — `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 — 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 — 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"mm/huge_memory.c"
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],
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"versions": [
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{
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"version": "adef440691bab824e39c1b17382322d195e1fab0",
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"lessThan": "df5f6e683e7f21a15d8be6e7a0c7a46436963ebe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "adef440691bab824e39c1b17382322d195e1fab0",
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"lessThan": "c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50",
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"status": "affected",
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"mm/huge_memory.c"
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],
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"versions": [
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{
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"version": "6.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.8.8",
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"lessThanOrEqual": "6.8.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"versionStartIncluding": "6.8",
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"versionEndExcluding": "6.8.8"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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"url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe"
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},
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"url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"
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}
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],
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"title": "userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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{
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"type": "ssvc",
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"content": {
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"timestamp": "2024-06-17T17:40:30.411881Z",
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"id": "CVE-2024-27007",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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"Technical Impact": "partial"
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"version": "2.0.3"
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2024-06-17T17:46:11.249Z"
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}
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe",
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{
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"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/"
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