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CVE-2023-53516

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute…

Published Oct 1, 2025CWE-787EPSS 0.14%

Overview

CVE-2023-53516 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF

The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for

broadcast cutoff") added one additional attribute named

IFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.

However, it forgot to describe the nla_policy at macvlan_policy

(drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer

can be faked as empty (0 bytes) by a malicious user, which could leads

to OOB in heap just like CVE-2023-3773.

To fix it, this commit just completes the nla_policy description for

IFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the

potential OOB read.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426Refgit.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53516?

CVE-2023-53516 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53516?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53516?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53516?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53516 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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