CVE-2026-46243
smb: client: reject userspace cifs.spnego descriptions
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
4th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jun 1, 2026 |
| Last Updated | Jun 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 7713bd320ed4fc3d08a227cd8e41242219a16981 f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 9544559e59438a4b609b2fdfa0763d8360572824 f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < cf20038657d6d4974349556a34e08fe0490bebbc f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 2035acfb17221729b1b8ac335e941868a04ca079 f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < a3bbda6502a9398b816fa2e71c9a3f955f58013d f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 91f89c1d83e80417629791fcef6af8140d7d01c8 f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 0aece6685fc80a8de492688ca2315fb86ec379c7 f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 3da1fdf4efbc490041eb4f836bf596201203f8f2
Linux / Linux
2.6.24
References
git.kernel.org: 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: https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079 git.kernel.org: https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d git.kernel.org: https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8 git.kernel.org: https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7 git.kernel.org: https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2 github.com: https://github.com/manizada/CIFSwitch openwall.com: http://www.openwall.com/lists/oss-security/2026/06/01/6