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        "title": "CISA ADP Vulnrichment"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: change src_folio after ensuring it\u0027s unpinned in UFFDIO_MOVE\n\nCommit d7a08838ab74 (\"mm: userfaultfd: fix unexpected change to src_folio\nwhen UFFDIO_MOVE fails\") moved the src_folio-\u003e{mapping, index} changing to\nafter clearing the page-table and ensuring that it\u0027s 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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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "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\u0027s 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-\u003emapping` 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."
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          "url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"
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      "title": "userfaultfd: change src_folio after ensuring it\u0027s unpinned in UFFDIO_MOVE",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-27007",
    "datePublished": "2024-05-01T05:29:08.528Z",
    "dateReserved": "2024-02-19T14:20:24.208Z",
    "dateUpdated": "2026-08-05T11:28:57.017Z",
    "state": "PUBLISHED"
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