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CVE-2026-46172

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ipv6: xfrm6: release dst on error in xfrm6_rcv_encap() xfrm6_rcv_encap() performs an IPv6 route lookup when the skb does not al…

Published May 28, 2026EPSS 0.17%

Overview

CVE-2026-46172 is a medium-severity vulnerability. It was published on May 28, 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:

ipv6: xfrm6: release dst on error in xfrm6_rcv_encap()

xfrm6_rcv_encap() performs an IPv6 route lookup when the skb does not

already have a dst attached. ip6_route_input_lookup() returns a

referenced dst entry even when the lookup resolves to an error route.

If dst->error is set, xfrm6_rcv_encap() drops the skb without attaching

the dst to the skb and without releasing the reference returned by the

lookup. Repeated packets hitting this path therefore leak dst entries.

Release the dst before jumping to the drop path.

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/554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13Refgit.kernel.org/stable/c/6a5eec0a2a0e99ec9743cf8f1c4082178811d90aRefgit.kernel.org/stable/c/870560015ce6e0d8f841c6a8aba33c44be52c727Refgit.kernel.org/stable/c/9d5047782f9bd2829e529df69209bf3232eb561fRefgit.kernel.org/stable/c/a0721bcd72641c32b281f227a94505b31cf54117Refgit.kernel.org/stable/c/a20b34f6e854fe6f2aa82528fae7a88759919eb4Refgit.kernel.org/stable/c/bc0fcb9823cd0894934cf968b525c575833d7078Refgit.kernel.org/stable/c/c2efc4956981066df2fef1cc77391b523db6d8e4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46172?

CVE-2026-46172 is a medium-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-46172?

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-2026-46172?

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-2026-46172?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46172 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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