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.

CVSS 3.1

7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-25)

CWEs

CWE-20, CWE-825

Published

2026-06-01

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• linux:linux_kernel

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

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