{"id":"CVE-2026-46243","summary":"smb: client: reject userspace cifs.spnego descriptions","details":"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.","modified":"2026-07-09T04:02:36.433601947Z","published":"2026-06-01T16:22:29.211Z","related":["ALSA-2026:23258","ALSA-2026:23259","ALSA-2026:23329","ALSA-2026:24381","SUSE-SU-2026:22048-1","SUSE-SU-2026:22076-1","SUSE-SU-2026:22087-1","SUSE-SU-2026:2310-1","SUSE-SU-2026:2317-1","SUSE-SU-2026:2331-1","SUSE-SU-2026:2332-1","SUSE-SU-2026:2383-1","SUSE-SU-2026:2421-1","SUSE-SU-2026:2482-1","openSUSE-SU-2026:10954-1","openSUSE-SU-2026:20912-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46243.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/01/6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46243.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23258"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23259"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23329"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23395"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24381"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25908"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26462"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26515"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26535"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26563"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26570"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:27708"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:27719"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:27729"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:27735"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28887"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28962"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33219"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33220"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33221"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33222"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33223"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33224"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33225"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33486"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34764"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34788"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34815"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-46243"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46243.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46243"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2481486"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"EVIDENCE","url":"https://github.com/manizada/CIFSwitch"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f1d662a7d5e5322e583aad6b3cfec03d8f27b435"},{"fixed":"7713bd320ed4fc3d08a227cd8e41242219a16981"},{"fixed":"9544559e59438a4b609b2fdfa0763d8360572824"},{"fixed":"cf20038657d6d4974349556a34e08fe0490bebbc"},{"fixed":"2035acfb17221729b1b8ac335e941868a04ca079"},{"fixed":"a3bbda6502a9398b816fa2e71c9a3f955f58013d"},{"fixed":"91f89c1d83e80417629791fcef6af8140d7d01c8"},{"fixed":"0aece6685fc80a8de492688ca2315fb86ec379c7"},{"fixed":"3da1fdf4efbc490041eb4f836bf596201203f8f2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46243.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},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