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Vulnerability Details CVE-2026-46243

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.8%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2026-46243


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