CVE-2024-27007 (GCVE-0-2024-27007)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:29 – Updated: 2026-08-05 11:28
VLAI
Title
userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
Summary
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE Commit d7a08838ab74 ("mm: userfaultfd: fix unexpected change to src_folio when UFFDIO_MOVE fails") moved the src_folio->{mapping, index} changing to after clearing the page-table and ensuring that it's not pinned. This avoids failure of swapout+migration and possibly memory corruption. However, the commit missed fixing it in the huge-page case.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:40 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: adef440691bab824e39c1b17382322d195e1fab0 , < df5f6e683e7f21a15d8be6e7a0c7a46436963ebe (git)
Affected: adef440691bab824e39c1b17382322d195e1fab0 , < c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "id": "CVE-2024-27007",
      "initial_release_date": "2024-05-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: userfaultfd: change src_folio after ensuring it\u0026#39;s unpinned in UFFDIO_MOVE",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-27007.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T02:42:02Z",
      "cve": "CVE-2024-27007",
      "id": "CVE-2024-27007",
      "initial_release_date": "2024-05-03T02:09:40Z",
      "product_status:known_not_affected": "385",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-27007",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-27007.json",
      "version": "19"
    },
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                "url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"
              },
              {
                "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/"
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              {
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/"
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            "title": "CVE Program Container"
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                  "content": {
                    "id": "CVE-2024-27007",
                    "options": [
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                      },
                      {
                        "Automatable": "no"
                      },
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                    "role": "CISA Coordinator",
                    "timestamp": "2024-06-17T17:40:30.411881Z",
                    "version": "2.0.3"
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            },
            "title": "CISA ADP Vulnrichment"
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        "cna": {
          "affected": [
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "mm/huge_memory.c"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "6.8"
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                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                {
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                  "status": "unaffected",
                  "version": "6.8.8",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
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          "cpeApplicability": [
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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."
            }
          ],
          "metrics": [
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                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "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\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."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:28:57.017Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
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              "url": "https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe"
            },
            {
              "url": "https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50"
            }
          ],
          "title": "userfaultfd: change src_folio after ensuring it\u0027s unpinned in UFFDIO_MOVE",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
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      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "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"
      },
      "dataType": "CVE_RECORD",
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  }
}



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