CVE-2026-46243 – smb: client: reject userspace cifs.spnego descriptions

CVE ID :CVE-2026-46243

Published : June 1, 2026, 5:17 p.m. | 1 hour, 15 minutes ago

Description :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.

Severity: 0.0 | NA

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