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CVE-2026-46243

HighPublished

smb: client: reject userspace cifs.spnego descriptions

Published: Jun 1, 2026
Updated: Sep 1, 2026
Assigning CNA: Linux
Evidence observed: Aug 13, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 31.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CIFSwitchPoC
Proof-of-concept exploit for CVE-2026-46243, leveraging a fake NSS library and namespace manipulation to escalate privileges via cifs.upcall.
CVE-2026-46243PoC
CVE-2026-46243

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