Linux Kernel RAW Socket IPPROTO_RAW Allows Malicious ICMP Acceptance
CVE-2026-46266 Published on June 3, 2026
inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
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.
Products Associated with CVE-2026-46266
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below db76b75ede3810e7cf9cfea5067d4f3e0993768b is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 19e42490c89bac9a388f28179e66bebbef350f99 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 531c1aec81bfe19d00af13da5531fbb8209e4bd2 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 719d3932b8f6e3348ce2f0ac58e278301fc17575 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c89477ad79446867394360b29bb801010fc3ff22 is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 6.6.128, <= 6.6.* is unaffected.
- Version 6.12.75, <= 6.12.* is unaffected.
- Version 6.18.14, <= 6.18.* is unaffected.
- Version 6.19.4, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.