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CVE-2026-53249

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict S…

Published Jun 25, 2026EPSS 0.13%

Overview

CVE-2026-53249 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

This patch restricts setting Loose Source and Record Route (LSRR)

and Strict Source and Record Route (SSRR) IP options to users

with CAP_NET_RAW capability.

This prevents unprivileged applications from forcing packets to route

through attacker-controlled nodes to leak TCP ISN and possibly other

protocol information.

While LSRR and SSRR are commonly filtered in many network environments,

they may still be supported and forwarded along some network paths.

RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing

IPv4 Options) recommend to drop these options in 4.3 and 4.4.

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/00e8845fe3428c69e980dce5071cb3da1d8f7578Refgit.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7Refgit.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691Refgit.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2Refgit.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278Refgit.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4dRefgit.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1Refgit.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53249?

CVE-2026-53249 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-53249?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53249?

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-2026-53249?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53249 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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