{"api_version":"1","generated_at":"2026-07-28T08:01:52+00:00","cve":"CVE-2026-64392","urls":{"html":"https://cve.report/CVE-2026-64392","api":"https://cve.report/api/cve/CVE-2026-64392.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64392","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64392"},"summary":{"title":"ksmbd: use opener credentials for delete-on-close","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use opener credentials for delete-on-close\n\nDelete-on-close can be completed by deferred or durable handle teardown,\nwhere no request work is available. Both the base-file unlink and the ADS\nxattr removal consequently run with the ksmbd worker credentials and can\nbypass filesystem permission checks.\n\nRun both operations with the credentials captured in struct file when the\nhandle was opened. This preserves the authenticated user's fsuid, fsgid,\nsupplementary groups and capability restrictions at final close.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:22","updated_at":"2026-07-27 05:16:46"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","data":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d","name":"https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0","name":"https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9","name":"https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d","name":"https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b","name":"https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64392","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64392","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f44158485826c076335d6860d35872271a83791d f08b3f451f12eee4abd8a5981803bc36db84458b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f44158485826c076335d6860d35872271a83791d 18c59109bb6fb816d5102171666f87cf1e29901d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f44158485826c076335d6860d35872271a83791d e72c15085b6d86f45d224d98aa75b5cace4aaab9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f44158485826c076335d6860d35872271a83791d 4b7059974549d278e30fe70e2a4e421f9839817d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use opener credentials for delete-on-close\n\nDelete-on-close can be completed by deferred or durable handle teardown,\nwhere no request work is available. Both the base-file unlink and the ADS\nxattr removal consequently run with the ksmbd worker credentials and can\nbypass filesystem permission checks.\n\nRun both operations with the credentials captured in struct file when the\nhandle was opened. This preserves the authenticated user's fsuid, fsgid,\nsupplementary groups and capability restrictions at final close."}],"metrics":[{"cvssV3_1":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-27T05:00:21.820Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b"},{"url":"https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d"},{"url":"https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9"},{"url":"https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d"},{"url":"https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0"}],"title":"ksmbd: use opener credentials for delete-on-close","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64392","datePublished":"2026-07-25T08:50:38.634Z","dateReserved":"2026-07-19T15:36:31.785Z","dateUpdated":"2026-07-27T05:00:21.820Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:22","lastModifiedDate":"2026-07-27 05:16:46","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64392","Ordinal":"1","Title":"ksmbd: use opener credentials for delete-on-close","CVE":"CVE-2026-64392","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64392","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use opener credentials for delete-on-close\n\nDelete-on-close can be completed by deferred or durable handle teardown,\nwhere no request work is available. Both the base-file unlink and the ADS\nxattr removal consequently run with the ksmbd worker credentials and can\nbypass filesystem permission checks.\n\nRun both operations with the credentials captured in struct file when the\nhandle was opened. This preserves the authenticated user's fsuid, fsgid,\nsupplementary groups and capability restrictions at final close.","Type":"Description","Title":"ksmbd: use opener credentials for delete-on-close"}]}}}