GHSA-3VGG-PC24-VV5M
Vulnerability from github – Published: 2026-06-03 18:33 – Updated: 2026-09-02 15:34In 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.
{
"affected": [],
"aliases": [
"CVE-2026-46266"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-03T18:16:28Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP\n\nYizhou Zhao reported that simply having one RAW socket on protocol\nIPPROTO_RAW (255) was dangerous.\n\n socket(AF_INET, SOCK_RAW, 255);\n\nA malicious incoming ICMP packet can set the protocol field to 255\nand match this socket, leading to FNHE cache changes.\n\ninner = IP(src=\"192.168.2.1\", dst=\"8.8.8.8\", proto=255)/Raw(\"TEST\")\npkt = IP(src=\"192.168.1.1\", dst=\"192.168.2.1\")/ICMP(type=3, code=4, nexthopmtu=576)/inner\n\n\"man 7 raw\" states:\n\n A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able\n to send any IP protocol that is specified in the passed header.\n Receiving of all IP protocols via IPPROTO_RAW is not possible\n using raw sockets.\n\nMake sure we drop these malicious packets.",
"id": "GHSA-3vgg-pc24-vv5m",
"modified": "2026-09-02T15:34:07Z",
"published": "2026-06-03T18:33:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46266"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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