Vulnerability-Lookup

CVE-2026-64514 (GCVE-0-2026-64514)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:52 – Updated: 2026-07-25 08:52

Title

userfaultfd: gate must_wait writability check on pte_present()

Summary

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: gate must_wait writability check on pte_present() userfaultfd_must_wait() and userfaultfd_huge_must_wait() read the PTE without taking the page table lock and then apply pte_write() / huge_pte_write() to it. Those accessors decode bits from the present encoding only; on a swap or migration entry they read the offset bits that happen to share the same position and return an undefined result. The intent of the check is "is this fault still WP-blocked?". A non-marker swap entry means the page is in transit -- the userfault context the original fault delivered against is no longer the same, and the swap-in or migration completion path will re-deliver a fresh fault if userspace still needs to handle it. Worst case under the current code the garbage write bit says "wait", and the thread stays asleep until a UFFDIO_WAKE that may never arrive. Gate the writability check on pte_present() so the lockless re-check only inspects present-PTE bits when the entry is actually present. The non-present, non-marker case returns "don't wait" and lets the fault path retry.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/a5700a4c1c9099ac2…
https://git.kernel.org/stable/c/d4026417e8184d138…
https://git.kernel.org/stable/c/29e6f952c5fb7dc1d…
https://git.kernel.org/stable/c/5f4dbdb0a87596214…
https://git.kernel.org/stable/c/a6e9a4939e3595997…
https://git.kernel.org/stable/c/60d696a037eeeedfb…
https://git.kernel.org/stable/c/710183888174639a1…
https://git.kernel.org/stable/c/8e80af52db652fbc4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 369cd2121be440543280b91056de187f625d0dbb , < a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < d4026417e8184d13850a0bad4d96ceb6ed9f7152 (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < 29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0 (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < 5f4dbdb0a87596214076b20b94f2b71b522170b3 (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < a6e9a4939e359599701b1da351e84f72e021443a (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < 60d696a037eeeedfb57756dfe7ec08a1587c8631 (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < 710183888174639a15fcec16cd1af766b8480bb7 (git) Affected: 369cd2121be440543280b91056de187f625d0dbb , < 8e80af52db652fbc41320eee45a4f73bc029faf2 (git)
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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A\\nnon-marker swap entry means the page is in transit -- the userfault\\ncontext the original fault delivered against is no longer the same, and\\nthe swap-in or migration completion path will re-deliver a fresh fault if\\nuserspace still needs to handle it.  Worst case under the current code the\\ngarbage write bit says \\\"wait\\\", and the thread stays asleep until a\\nUFFDIO_WAKE that may never arrive.\\n\\nGate the writability check on pte_present() so the lockless re-check only\\ninspects present-PTE bits when the entry is actually present.  The\\nnon-present, non-marker case returns \\\"don\u0027t wait\\\" and lets the fault path\\nretry.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"mm/userfaultfd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"d4026417e8184d13850a0bad4d96ceb6ed9f7152\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"5f4dbdb0a87596214076b20b94f2b71b522170b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"a6e9a4939e359599701b1da351e84f72e021443a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"60d696a037eeeedfb57756dfe7ec08a1587c8631\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"710183888174639a15fcec16cd1af766b8480bb7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"369cd2121be440543280b91056de187f625d0dbb\",\"lessThan\":\"8e80af52db652fbc41320eee45a4f73bc029faf2\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"mm/userfaultfd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f4dbdb0a87596214076b20b94f2b71b522170b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60d696a037eeeedfb57756dfe7ec08a1587c8631\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/710183888174639a15fcec16cd1af766b8480bb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e80af52db652fbc41320eee45a4f73bc029faf2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6e9a4939e359599701b1da351e84f72e021443a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4026417e8184d13850a0bad4d96ceb6ed9f7152\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}

GHSA-R2GX-XM5R-33F5

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

userfaultfd: gate must_wait writability check on pte_present()

userfaultfd_must_wait() and userfaultfd_huge_must_wait() read the PTE without taking the page table lock and then apply pte_write() / huge_pte_write() to it. Those accessors decode bits from the present encoding only; on a swap or migration entry they read the offset bits that happen to share the same position and return an undefined result.

The intent of the check is "is this fault still WP-blocked?". A non-marker swap entry means the page is in transit -- the userfault context the original fault delivered against is no longer the same, and the swap-in or migration completion path will re-deliver a fresh fault if userspace still needs to handle it. Worst case under the current code the garbage write bit says "wait", and the thread stays asleep until a UFFDIO_WAKE that may never arrive.

Gate the writability check on pte_present() so the lockless re-check only inspects present-PTE bits when the entry is actually present. The non-present, non-marker case returns "don't wait" and lets the fault path retry.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64514"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:37Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: gate must_wait writability check on pte_present()\n\nuserfaultfd_must_wait() and userfaultfd_huge_must_wait() read the PTE\nwithout taking the page table lock and then apply pte_write() /\nhuge_pte_write() to it.  Those accessors decode bits from the present\nencoding only; on a swap or migration entry they read the offset bits that\nhappen to share the same position and return an undefined result.\n\nThe intent of the check is \"is this fault still WP-blocked?\".  A\nnon-marker swap entry means the page is in transit -- the userfault\ncontext the original fault delivered against is no longer the same, and\nthe swap-in or migration completion path will re-deliver a fresh fault if\nuserspace still needs to handle it.  Worst case under the current code the\ngarbage write bit says \"wait\", and the thread stays asleep until a\nUFFDIO_WAKE that may never arrive.\n\nGate the writability check on pte_present() so the lockless re-check only\ninspects present-PTE bits when the entry is actually present.  The\nnon-present, non-marker case returns \"don\u0027t wait\" and lets the fault path\nretry.",
  "id": "GHSA-r2gx-xm5r-33f5",
  "modified": "2026-07-25T12:31:39Z",
  "published": "2026-07-25T12:31:38Z",
  "references": [
    {
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64514"
    },
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      "url": "https://git.kernel.org/stable/c/29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f4dbdb0a87596214076b20b94f2b71b522170b3"
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    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4026417e8184d13850a0bad4d96ceb6ed9f7152"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-64514 (GCVE-0-2026-64514)

GHSA-R2GX-XM5R-33F5

Tags

Sightings

Nomenclature