CyberSecBulletin
CVE-2025-68764NVD status: Deferred

Linux: Missing Authorization

Published Updated By the CyberSecBulletin desk

CVE-2025-68764 is a high-severity missing authorization vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 a3dc6c40bcab1a888d5c0d134ccc0746b4c98929, ba1495aefd22fcf0746a2a3025c95d766d7cde4d, c09070b4def1b34e473a746c6a5331ccb80902c1 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 0.17% 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 a3dc6c40bcab1a888d5c0d134ccc0746b4c98929 or ba1495aefd22fcf0746a2a3025c95d766d7cde4d or c09070b4def1b34e473a746c6a5331ccb80902c1 or dce10c59211e5cd763a62ea01e79b82a629811e3, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxf2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, a3dc6c40bcab1a888d5c0d134ccc0746b4c98929; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, ba1495aefd22fcf0746a2a3025c95d766d7cde4d; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, c09070b4def1b34e473a746c6a5331ccb80902c1; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, dce10c59211e5cd763a62ea01e79b82a629811e3; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, 612cc98698d667df804792f0c47d4e501e66da29; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, 4b296944e632cf4c6a4cc8e2585c6451eae47b1b; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, df9b003a2ecacc7218486fbb31fe008c93097d5f; f2aedb713c284429987dc66c7aaf38decfc8da2a up to, but not including, 8675c69816e4276b979ff475ee5fac4688f80125; and 1 more rangesa3dc6c40bcab1a888d5c0d134ccc0746b4c98929, ba1495aefd22fcf0746a2a3025c95d766d7cde4d, c09070b4def1b34e473a746c6a5331ccb80902c1, dce10c59211e5cd763a62ea01e79b82a629811e3, 612cc98698d667df804792f0c47d4e501e66da29, 4b296944e632cf4c6a4cc8e2585c6451eae47b1b
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)V3.1.6 and later; V3.1.7 and laterNot stated

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
HighThe component can be taken down completely.

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

Official description

In the Linux kernel, the following vulnerability has been resolved: NFS: Automounted filesystems should inherit ro,noexec,nodev,sync flags When a filesystem is being automounted, it needs to preserve the user-set superblock mount options, such as the "ro" flag.

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.

More Missing Authorization vulnerabilities (CWE-862)

Timeline

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

References

Recent Missing Authorization vulnerabilities

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