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CVE-2026-52998

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a…

Published Jun 24, 2026CWE-476EPSS 0.58%

Overview

CVE-2026-52998 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

The nf_osf_ttl() function accessed skb->dev to perform a local interface

address lookup without verifying that the device pointer was valid.

Additionally, the implementation utilized an in_dev_for_each_ifa_rcu

loop to match the packet source address against local interface

addresses. It assumed that packets from the same subnet should not see a

decrement on the initial TTL. A packet might appear it is from the same

subnet but it actually isn't especially in modern environments with

containers and virtual switching.

Remove the device dereference and interface loop. Replace the logic with

a switch statement that evaluates the TTL according to the ttl_check.

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/5d05de2f0928d81309a815ecc76d1a3ad72cbc16Refgit.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114Refgit.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293Refgit.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80bRefgit.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8Refgit.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4Refgit.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277Refgit.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52998?

CVE-2026-52998 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-52998?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-52998?

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-2026-52998?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52998 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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