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Vulnerabilities CVE-2026-46243

CVE-2026-46243

High
Open
TLP:CLEAR

smb: client: reject userspace cifs.spnego descriptions

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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.

Details

CVSS Score
7.1
EPSS Score
0.38%

30.7th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
Jun 1, 2026
Last Modified
Aug 7, 2026
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