Vulnerability details
CVE-2026-46243
Linux LinuxSiemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
smb: client: reject userspace cifs.spnego descriptions
CVSS 3.1
7.1High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 7.1High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 2.6.24 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < 9544559e59438a4b609b2fdfa0763d8360572824 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < cf20038657d6d4974349556a34e08fe0490bebbc | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < 2035acfb17221729b1b8ac335e941868a04ca079 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < a3bbda6502a9398b816fa2e71c9a3f955f58013d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < 91f89c1d83e80417629791fcef6af8140d7d01c8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < 0aece6685fc80a8de492688ca2315fb86ec379c7 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < 3da1fdf4efbc490041eb4f836bf596201203f8f2 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ≤ v < 7713bd320ed4fc3d08a227cd8e41242219a16981 | CVEProject cvelistV5 (CNA) |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | All | CVEProject cvelistV5 (CNA) |
References and advisories
48- https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
- https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
- https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
- https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
- https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d
- https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8
- https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7
- https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2
- https://github.com/manizada/CIFSwitch exploit
- http://www.openwall.com/lists/oss-security/2026/06/01/6
- https://access.redhat.com/security/cve/CVE-2026-46243 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2481486 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46243.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:23395 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33486 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:27719 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:27729 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:41236 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:34048 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:40021 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:28887 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:28962 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36620 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:47727 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:34815 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:34757 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:34788 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:34764 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:25908 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23329 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26515 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:27735 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:27708 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24381 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33225 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23258 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33220 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26535 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26570 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26563 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33219 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33221 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33222 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33223 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33224 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23259 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:26462 vendor-advisoryx_refsource_REDHAT
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
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Details
- Published
- 2026-06-01
- Last updated
- 2026-10-15
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.41%
Probability of exploitation in 30 days
35.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-20Improper Input Validation
- CWE-825Expired Pointer Dereference