Linux: Missing Authorization
CVE-2026-46174 is a high-severity missing authorization vulnerability in Linux, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 1e23b30a80b14e5764657401ee2cca030525ae8e, f5bc3aef7df46eaaf423d7413ab8833f704ae576, 251497955f2314cd39d43191e81c6151dead4c7b as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.15% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 1e23b30a80b14e5764657401ee2cca030525ae8e or f5bc3aef7df46eaaf423d7413ab8833f704ae576 or 251497955f2314cd39d43191e81c6151dead4c7b or ff6fc65b3bf73acc5ee71919154d830ad5431362, whichever matches your release line, or a later version.
- Update Linux Kernel to 3.17 or 4.5 or 4.10 or 5.10.256, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, 1e23b30a80b14e5764657401ee2cca030525ae8e; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, f5bc3aef7df46eaaf423d7413ab8833f704ae576; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, 251497955f2314cd39d43191e81c6151dead4c7b; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, ff6fc65b3bf73acc5ee71919154d830ad5431362; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, 9109489cc8c34e50d15575a3d1ff82af586bc1aa; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, 28f5ed477eef166d678d6966762cbc1de9b4f436; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, 1cd85a19748b2407830376a5cbae5c0f126016e5; f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 up to, but not including, c21b90f77687075115d989e53a8ec5e2bb427ab1; and 7 more ranges | 1e23b30a80b14e5764657401ee2cca030525ae8e, f5bc3aef7df46eaaf423d7413ab8833f704ae576, 251497955f2314cd39d43191e81c6151dead4c7b, ff6fc65b3bf73acc5ee71919154d830ad5431362, 9109489cc8c34e50d15575a3d1ff82af586bc1aa, 28f5ed477eef166d678d6966762cbc1de9b4f436 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) | V3.1.6 and later; V3.1.5 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) | V3.1.6 and later; V3.1.5 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) | V3.1.6 and later; V3.1.5 and later; V3.1.7 and later | Not stated |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) | V3.1.6 and later; V3.1.5 and later; V3.1.7 and later | Not stated |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) | V3.1.6 and later; V3.1.5 and later; V3.1.7 and later | Not stated |
| Linux | Linux Kernel | 3.16.58 up to, but not including, 3.17; 4.4.144 up to, but not including, 4.5; 4.9.102 up to, but not including, 4.10; 4.14.1 up to, but not including, 5.10.256; 5.11 up to, but not including, 5.15.207; 5.16 up to, but not including, 6.1.173; 6.2 up to, but not including, 6.6.139; 6.7 up to, but not including, 6.12.88; and 4 more ranges | 3.17, 4.5, 4.10, 5.10.256, 5.15.207, 6.1.173 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. Scored by CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache Make sure resources are not improperly shared in the op cache and cause instruction corruption this way.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Missing Authorization
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
How developers prevent this class of flaw
- Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework and the OWASP ESAPI Access Control feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/1cd85a19748b2407830376a5cbae5c0f126016e5
- git.kernel.org/stable/c/1e23b30a80b14e5764657401ee2cca030525ae8e
- git.kernel.org/stable/c/251497955f2314cd39d43191e81c6151dead4c7b
- git.kernel.org/stable/c/28f5ed477eef166d678d6966762cbc1de9b4f436
- git.kernel.org/stable/c/9109489cc8c34e50d15575a3d1ff82af586bc1aa
- git.kernel.org/stable/c/c21b90f77687075115d989e53a8ec5e2bb427ab1
- git.kernel.org/stable/c/f5bc3aef7df46eaaf423d7413ab8833f704ae576
- git.kernel.org/stable/c/ff6fc65b3bf73acc5ee71919154d830ad5431362
Other references
Recent Missing Authorization vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 7.2 High severity
- 8.8 High severity
- 7.5 High severity
- 9.9 Critical severity
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