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High 7.1Published Jun 1, 2026
CVE-2026-46243smb: client: reject userspace cifs.spnego descriptions
Updated under an hour ago ()
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It affects Linux and 13 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-20, CWE-825
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 7713bd320ed4fc3d08a227cd8e41242219a16981; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 9544559e59438a4b609b2fdfa0763d8360572824; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before cf20038657d6d4974349556a34e08fe0490bebbc; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 2035acfb17221729b1b8ac335e941868a04ca079; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before a3bbda6502a9398b816fa2e71c9a3f955f58013d; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 91f89c1d83e80417629791fcef6af8140d7d01c8; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 0aece6685fc80a8de492688ca2315fb86ec379c7; from f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 3da1fdf4efbc490041eb4f836bf596201203f8f2 | CNA record |
Red Hat NVIDIA for RHEL 10 redhat:enterprise_linux_nvidia | from 0:6.12.0-212.9.el10nv not affected; from 0:6.12.0-231.12.el10nv not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.20.1.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:6.12.0-55.79.1.el10_0 not affected | CISA ADP |
from 0:2.6.32-754.61.1.el6 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_extras_rt_els | from 0:3.10.0-1160.155.1.rt56.1307.el7 not affected | CISA ADP |
from 0:4.18.0-305.194.1.el8_4 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:4.18.0-305.194.1.el8_4 not affected | CISA ADP |
from 0:4.18.0-477.147.1.el8_8 not affected | CISA ADP | |
from 0:4.18.0-477.147.1.el8_8 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:5.14.0-570.123.1.el9_6 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202606251120-0 not affected | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.24.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 2.6.24; and 10 more ranges | NVD |
References
- https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981patch
- https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824patch
- https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbcpatch
- https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079patch
- https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013dpatch
- https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8patch
- https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7patch
- https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2patch
- http://www.openwall.com/lists/oss-security/2026/06/01/6mailing-list, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:23258
- https://access.redhat.com/errata/RHSA-2026:23259
- https://access.redhat.com/errata/RHSA-2026:23329
- https://access.redhat.com/errata/RHSA-2026:23395
- https://access.redhat.com/errata/RHSA-2026:24381
- https://access.redhat.com/errata/RHSA-2026:25908
- https://access.redhat.com/errata/RHSA-2026:26462
- https://access.redhat.com/errata/RHSA-2026:26515
- https://access.redhat.com/errata/RHSA-2026:26535
- https://access.redhat.com/errata/RHSA-2026:26563
- https://access.redhat.com/errata/RHSA-2026:26570
- https://access.redhat.com/errata/RHSA-2026:27708
- https://access.redhat.com/errata/RHSA-2026:27719
- https://access.redhat.com/errata/RHSA-2026:27729
- https://access.redhat.com/errata/RHSA-2026:27735
- https://access.redhat.com/errata/RHSA-2026:28887
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.