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CVE-2026-46266

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP Yizhou Zhao reported that simply having one RAW socket on protocol…

Published Jun 3, 2026EPSS 0.37%

Overview

CVE-2026-46266 is a critical-severity vulnerability. It was published on June 3, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, 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:

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP

Yizhou Zhao reported that simply having one RAW socket on protocol

IPPROTO_RAW (255) was dangerous.

socket(AF_INET, SOCK_RAW, 255);

A malicious incoming ICMP packet can set the protocol field to 255

and match this socket, leading to FNHE cache changes.

inner = IP(src="192.168.2.1", dst="8.8.8.8", proto=255)/Raw("TEST")

pkt = IP(src="192.168.1.1", dst="192.168.2.1")/ICMP(type=3, code=4, nexthopmtu=576)/inner

"man 7 raw" states:

A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able

to send any IP protocol that is specified in the passed header.

Receiving of all IP protocols via IPPROTO_RAW is not possible

using raw sockets.

Make sure we drop these malicious packets.

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/19e42490c89bac9a388f28179e66bebbef350f99Refgit.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2Refgit.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575Refgit.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22Refgit.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46266?

CVE-2026-46266 is a critical-severity vulnerability. It was published on June 3, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-46266?

This vulnerability has a CVSS 3.1 base score of 9.1, 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-2026-46266?

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-2026-46266?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46266 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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