{"api_version":"1","generated_at":"2026-06-01T22:31:32+00:00","cve":"CVE-2026-46243","urls":{"html":"https://cve.report/CVE-2026-46243","api":"https://cve.report/api/cve/CVE-2026-46243.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46243","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46243"},"summary":{"title":"smb: client: reject userspace cifs.spnego descriptions","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-01 17:17:34","updated_at":"2026-06-01 21:16:46"},"problem_types":["CWE-20","CWE-20 CWE-20 Improper Input 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the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key."}],"providerMetadata":{"dateUpdated":"2026-06-01T16:22:29.211Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981"},{"url":"https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824"},{"url":"https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc"},{"url":"https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079"},{"url":"https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d"},{"url":"https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8"},{"url":"https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7"},{"url":"https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2"}],"title":"smb: client: reject userspace cifs.spnego descriptions","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46243","datePublished":"2026-06-01T16:22:29.211Z","dateReserved":"2026-05-13T15:03:33.107Z","dateUpdated":"2026-06-01T18:55:00.540Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-01 17:17:34","lastModifiedDate":"2026-06-01 21:16:46","problem_types":["CWE-20","CWE-20 CWE-20 Improper Input Validation"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46243","Ordinal":"1","Title":"smb: client: reject userspace cifs.spnego descriptions","CVE":"CVE-2026-46243","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46243","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key.","Type":"Description","Title":"smb: client: reject userspace cifs.spnego descriptions"}]}}}