CVE-2024-27007 (GCVE-0-2024-27007)
Vulnerability from cvelistv5 – Published: 2024-05-01 05:29 – Updated: 2026-08-05 11:28
VLAI
EPSS
VEX
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)
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
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
adef440691bab824e39c1b17382322d195e1fab0 , < df5f6e683e7f21a15d8be6e7a0c7a46436963ebe
(git)
Affected: adef440691bab824e39c1b17382322d195e1fab0 , < c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50 (git) |
|
| Linux | Linux |
Affected:
6.8
Unaffected: 0 , < 6.8 (semver) Unaffected: 6.8.8 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
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"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8.8",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9",
"versionStartIncluding": "6.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"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": [
{
"cvssV3_1": {
"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": [
{
"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"
}
}
},
"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",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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