CriticalFix available
inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
Type: advisorySources: OSV
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
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.187, 6.12.75, 6.18.14, 6.19.4, 6.6.128
- CVEs
- CVE-2026-46266
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 18:40 UTC · Revision 1
Source evidence
inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
core-osv · Original sourcePublished 3 Jun 2026, 15:50 UTC
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.
osv:CVE-2026-46266
Kernel
Fixed versions: 6.1.187, 6.6.128, 6.12.75, 6.18.14, 6.19.4
Complete source record
{
"id": "a1876100b8e5b411b50b20d1a47ba52c767ac00290ef3ec321ca203035154cee",
"url": "https://osv.dev/vulnerability/CVE-2026-46266",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP",
"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.",
"evidence": "osv:CVE-2026-46266",
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"type": "CVSS_V3",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46266.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.6.12"
},
{
"fixed": "6.1.187"
}
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{
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{
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},
{
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}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "6.19.4"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46266.json"
}
}
],
"modified": "2026-10-28T02:30:38.218341771Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99",
"https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01",
"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",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46266.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-46266",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46266.json"
}
},
"related_cves": [
{
"value": "CVE-2026-46266",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 505783,
"published_at": "2026-06-03T15:50:07.907+00:00"
}