CVE-2026-64514

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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't wait\" and lets the fault path\nretry."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/userfaultfd.c"], "versions": [{"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "d4026417e8184d13850a0bad4d96ceb6ed9f7152", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "5f4dbdb0a87596214076b20b94f2b71b522170b3", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "a6e9a4939e359599701b1da351e84f72e021443a", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "60d696a037eeeedfb57756dfe7ec08a1587c8631", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "710183888174639a15fcec16cd1af766b8480bb7", "status": "affected", "versionType": "git"}, {"version": "369cd2121be440543280b91056de187f625d0dbb", "lessThan": "8e80af52db652fbc41320eee45a4f73bc029faf2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/userfaultfd.c"], "versions": [{"version": "4.11", "status": "affected"}, {"version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, 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"7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f"}, {"url": "https://git.kernel.org/stable/c/d4026417e8184d13850a0bad4d96ceb6ed9f7152"}, {"url": "https://git.kernel.org/stable/c/29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0"}, {"url": "https://git.kernel.org/stable/c/5f4dbdb0a87596214076b20b94f2b71b522170b3"}, {"url": "https://git.kernel.org/stable/c/a6e9a4939e359599701b1da351e84f72e021443a"}, {"url": "https://git.kernel.org/stable/c/60d696a037eeeedfb57756dfe7ec08a1587c8631"}, {"url": "https://git.kernel.org/stable/c/710183888174639a15fcec16cd1af766b8480bb7"}, {"url": "https://git.kernel.org/stable/c/8e80af52db652fbc41320eee45a4f73bc029faf2"}], "title": "userfaultfd: gate must_wait writability check on pte_present()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64514", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:40:57.422475Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:44:56.292Z"}}]}}

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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't wait\" and lets the fault path\nretry."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.96", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.39", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.4", "versionStartIncluding": "4.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:57:05.592Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64514", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:44:56.292Z", "dateReserved": "2026-07-19T15:36:31.793Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-25T08:52:05.878Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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't wait\" and lets the fault path\nretry."}], "id": "CVE-2026-64514", "lastModified": "2026-11-06T17:18:59.687", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64514", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:40:57.422475Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:37.633", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: userfaultfd: gate must_wait writability check on pte_present()", "id": "2507219", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507219"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["A flaw was found in the Linux kernel's userfaultfd mechanism. This vulnerability occurs when the userfaultfd_must_wait() and userfaultfd_huge_must_wait() functions incorrectly read Page Table Entries (PTEs) without proper locking during memory operations. This can lead to an undefined state if a page is being swapped or migrated, potentially causing a process to become unresponsive. The most significant consequence is a denial of service (DoS), where a user's application may freeze indefinitely."], "name": "CVE-2026-64514", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64514\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64514\nhttps://lore.kernel.org/linux-cve-announce/2026072555-CVE-2026-64514-11d4@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,d4026417e8184d13850a0bad4d96ceb6ed9f7152)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,5f4dbdb0a87596214076b20b94f2b71b522170b3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,a6e9a4939e359599701b1da351e84f72e021443a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,60d696a037eeeedfb57756dfe7ec08a1587c8631)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,710183888174639a15fcec16cd1af766b8480bb7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[369cd2121be440543280b91056de187f625d0dbb,8e80af52db652fbc41320eee45a4f73bc029faf2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-25T22:15:03.723360+00:00", "updated": "2026-08-04T14:15:10.474580+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-368"]}