CVE-2026-46266

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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99	Patch
https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01
https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2	Patch
https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575	Patch
https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22	Patch
https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:-::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc2::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc3::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc4::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::

History

No history.

Information

Published : 2026-06-03 18:16

Updated : 2026-09-02 13:17

NVD link : CVE-2026-46266

Mitre link : CVE-2026-46266

CVE.ORG link : CVE-2026-46266

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo

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"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "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 inform\u00f3 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 cach\u00e9 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 recepci\u00f3n de todos los protocolos IP a trav\u00e9s de IPPROTO_RAW no es posible usando sockets raw.\n\nAsegur\u00e9monos de descartar estos paquetes maliciosos."}], "lastModified": "2026-09-02T13:17:55.727", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1FF1E929-B673-4389-A990-86F9AA75B8FA", "versionEndExcluding": "6.6.128", "versionStartIncluding": "2.6.12.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2", "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BF463CB7-1F58-4607-B847-77ED23E4B9B7", "versionEndExcluding": "6.18.14", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092", "versionEndExcluding": "6.19.4", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6F62EECE-8FB1-4D57-85D8-CB9E23CF313C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4F76C298-81DC-43E4-8FC9-DC005A2116EF"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0AB349B2-3F78-4197-882B-90ADB3BF645A"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6AC88830-A9BC-4607-B572-A4B502FC9FD0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "476CB3A5-D022-4F13-AAEF-CB6A5785516A"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}