CVE-2026-46243

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.

References

• https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7
• https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
• https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2
• https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
• https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8