CyberSecBulletin
CVE-2026-46150NVD status: Modified

Linux: Incorrect Authorization

Published Updated By the CyberSecBulletin desk

CVE-2026-46150 is a high-severity incorrect authorization vulnerability in Linux, with a CVSS 3.1 base score of 7.1 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 a24765332e129c1916d5a6615418b75599b8fcdc, 4a7611ad653785fcdea5ff5f4441e2b7d05b7f11, 04bb66be92f48ed13c3faf1139d892df228789bc 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 0.13% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to a24765332e129c1916d5a6615418b75599b8fcdc or 4a7611ad653785fcdea5ff5f4441e2b7d05b7f11 or 04bb66be92f48ed13c3faf1139d892df228789bc or 895ebbedf88318607c24acc0f591c74b165e1d0a, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.258 or 5.15.209 or 6.1.175 or 6.6.140, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxabc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, a24765332e129c1916d5a6615418b75599b8fcdc; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, 4a7611ad653785fcdea5ff5f4441e2b7d05b7f11; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, 04bb66be92f48ed13c3faf1139d892df228789bc; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, 895ebbedf88318607c24acc0f591c74b165e1d0a; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, f130790f1acc8399f32652846c875a251efd040f; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, 7baa02b0ae9d17ec5f08836d8ea88ce1927d0678; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, b7b24b28c8cd55844cab908f4f39dded638d5538; abc77577a669f424c5d0c185b9994f2621c52aa4 up to, but not including, 7746e3bd4cc19b5092e00d32d676e329bfcb6900; and 1 more rangesa24765332e129c1916d5a6615418b75599b8fcdc, 4a7611ad653785fcdea5ff5f4441e2b7d05b7f11, 04bb66be92f48ed13c3faf1139d892df228789bc, 895ebbedf88318607c24acc0f591c74b165e1d0a, f130790f1acc8399f32652846c875a251efd040f, 7baa02b0ae9d17ec5f08836d8ea88ce1927d0678
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel4.12 up to, but not including, 5.10.258; 5.11 up to, but not including, 5.15.209; 5.16 up to, but not including, 6.1.175; 6.2 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.88; 6.13 up to, but not including, 6.18.30; 6.19 up to, but not including, 7.0.7; 7.15.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.18.30

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
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: fanotify: fix false positive on permission events fsnotify_get_mark_safe() may return false for a mark on an unrelated group, which results in bypassing the permission check. Fix by skipping over detached marks that are not in the current group.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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.

More Incorrect Authorization vulnerabilities (CWE-863)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Incorrect Authorization vulnerabilities

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