CVE-2026-46266
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
In the Linux kernel, a vulnerability in RAW sockets using IPPROTO_RAW allows malicious ICMP packets to set the protocol field to 255 and match such a socket, leading to FNHE cache changes.
Risk Assessment
Risk of routing cache poisoning and potential network traffic interception by a remote attacker.
Recommendation
Apply the Linux kernel patch that drops incoming ICMP packets for RAW sockets with IPPROTO_RAW.
Original NVD description (English source)
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.