CVE-2026-46243

HighCVSS 7.1/10Last modified Oct 15, 2026

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-20CWE-825

Affected software

No affected versions have been published.

Timeline

Published
Jun 1, 2026
Last modified
Oct 15, 2026
NVD status
Modified

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CVE-2026-46243: High severity, CVSS 7.1 | Vulnix