CVE-2026-46266
Full vulnerability record from the local CVENow database.
Description
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.
Severity
CRITICAL
CVSS score
9.1
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-03 18:16:28.147000
Last modified
2026-10-19 20:18:40.257000
View original CVE JSON
{
"id": "CVE-2026-46266",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-06-03T18:16:28.147",
"lastModified": "2026-10-19T20:18:40.257",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ninet: Los sockets RAW que usan IPPROTO_RAW DEBEN descartar el ICMP entrante\n\nYizhou Zhao informó que simplemente tener un socket RAW en el protocolo IPPROTO_RAW (255) era peligroso.\n\nsocket(AF_INET, SOCK_RAW, 255);\n\nUn paquete ICMP entrante malicioso puede establecer el campo de protocolo en 255 y coincidir con este socket, lo que lleva a cambios en la caché FNHE.\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' establece:\n\nUn protocolo de IPPROTO_RAW implica IP_HDRINCL habilitado y es capaz de enviar cualquier protocolo IP que se especifica en la cabecera pasada. La recepción de todos los protocolos IP a través de IPPROTO_RAW no es posible usando sockets raw.\n\nAsegurémonos de descartar estos paquetes maliciosos."
}
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"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
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