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CVE-2026-31668

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: seg6: separate dst_cache for input and output paths in seg6 lwtunnel The seg6 lwtunnel uses a single dst_cache per encap route,…

Published Apr 24, 2026EPSS 0.44%

Overview

CVE-2026-31668 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. 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:

seg6: separate dst_cache for input and output paths in seg6 lwtunnel

The seg6 lwtunnel uses a single dst_cache per encap route, shared

between seg6_input_core() and seg6_output_core(). These two paths

can perform the post-encap SID lookup in different routing contexts

(e.g., ip rules matching on the ingress interface, or VRF table

separation). Whichever path runs first populates the cache, and the

other reuses it blindly, bypassing its own lookup.

Fix this by splitting the cache into cache_input and cache_output,

so each path maintains its own cached dst independently.

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/17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6aRefgit.kernel.org/stable/c/1dec91d3b1cefb82635761b7812154af3ef46449Refgit.kernel.org/stable/c/57d0374d14fa667dec6952173b93e7e84486d5c9Refgit.kernel.org/stable/c/6305ad032b03d2ea4181b953a66e19a9a6ed053cRefgit.kernel.org/stable/c/750569d6987a0ff46317a4b86eb3907e296287bfRefgit.kernel.org/stable/c/84d458018b147176b259347103fccb7e93abd2b1Refgit.kernel.org/stable/c/c3812651b522fe8437ebb7063b75ddb95b571643Refgit.kernel.org/stable/c/fb56de5d99218de49d5d43ef3a99e062ecd0f9a1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31668?

CVE-2026-31668 is a critical-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-31668?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31668?

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-2026-31668?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31668 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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