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CVE-2026-46243

smb: client: reject userspace cifs.spnego descriptions

Published: Jun 1, 2026Updated: Jun 1, 2026 Sources: CVE List NVD
NVD MITRE
7.8CVSS
HIGH

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High

Weaknesses

CWE-20

Affected Products

Linux
Linux

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
git.kernel.org
https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
git.kernel.org
https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
git.kernel.org
and 6 more references View all →

Timeline

Published
Jun 1, 2026
Last Updated
Jun 1, 2026

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