CVE-2026-46243
smb: client: reject userspace cifs.spnego descriptions
CVSS Score
7.1
EPSS Score
0.4%
EPSS Percentile
28th
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 | Jul 23, 2026 |
Stay Ahead of the Next One
Get instant alerts for linux linux
Be the first to know when new high vulnerabilities affecting linux linux are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
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 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-46243 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2481486 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46243.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23395 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33486 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27719 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27729 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41236 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34048 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40021 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:28887 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:28962 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36620 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34815 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34757 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34788 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34764 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25908 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23329 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26515 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27735 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:27708 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:24381 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33225 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23258 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33220 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26535 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26570 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26563 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33219 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33221 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33222 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33223 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33224 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23259 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26462