CRITICAL: CVE-2026-46266 (CVSS 9.1) — multiple products

CVE: CVE-2026-46266

CVSS: 9.1 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Severity: CRITICAL

Status: Critical advisory

Affected

_See vendor advisory_

Summary

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.

Verified Sources

• NVD entry
• GitHub Advisory
• MITRE

References

• https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99
• https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2
• https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575
• https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22
• https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._