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CVE-2026-46243

smb: client: reject userspace cifs.spnego descriptions

Published: Jun 1, 2026Updated: Jul 20, 2026 Sources: CVE List NVD BDUNVD-CWE-noinfo
7.1HIGH
NVD MITRE
EPSS Score
0.4%
Top 72.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:N
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:NAvailability
None
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Weaknesses

NVD-CWE-noinfoCWE-20CWE-825

Affected Products

Сообщество свободного программного обеспечения
oss-projectaka fsf
Debian GNU/LinuxOn-premOS
Operating Systems / linux-distro
LinuxOn-premOS
Operating Systems / linux-distro
Novell Inc.
commercial·US
OpenSUSE LeapOn-premOS
Operating Systems / linux-distro
Suse Linux Enterprise ServerOn-premOS
Operating Systems / linux-distro
Linux
oss-projectaka the linux kernel
LinuxOn-premOS
Operating Systems / linux-distro
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
Astra Linux Special EditionOn-premOS
Operating Systems / linux-distro
Canonical Ltd.
commercial·GBaka canonical
UbuntuOn-premOS
Operating Systems / linux-distro
Oracle Corp.
commercial·USaka oracle
Oracle LinuxOn-premOS
Operating Systems / linux-distro
and 8 more affected products View all →

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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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 61 more references View all →

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