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.

Affected products

Linuxmint, Linux Kernel, Red Os, Rocky Linux

Linux Linux Kernel

< 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 2.6.24, 7.1

Fix

Available

CVSS 3.1

7.8 HIGH

EPSS

0.4% (31th percentile)

Weakness

CWE-825, CWE-20

NVD status

Modified

Published

2026-06-01