inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP (CVE-2026-46266) | HOL Guard CVE

Critical · CVSS 9.1CVE-2026-46266

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP

Answer in brief

CVE-2026-46266 records a Critical severity (CVSS 9.1) vulnerability in inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 3, 2026Updated Sep 2, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Sep 2, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.1
Exploitation: Not marked as known exploited
Affected software: 9 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:2.6.12:-::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc2::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc3::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc4::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db76b75ede3810e7cf9cfea5067d4f3e0993768b \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <19e42490c89bac9a388f28179e66bebbef350f99 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <531c1aec81bfe19d00af13da5531fbb8209e4bd2 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <719d3932b8f6e3348ce2f0ac58e278301fc17575 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c89477ad79446867394360b29bb801010fc3ff22	db76b75ede3810e7cf9cfea5067d4f3e0993768b, 19e42490c89bac9a388f28179e66bebbef350f99, 531c1aec81bfe19d00af13da5531fbb8209e4bd2, 719d3932b8f6e3348ce2f0ac58e278301fc17575, c89477ad79446867394360b29bb801010fc3ff22
Linux/Linuxgeneric	2.6.12	Not reported
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47276297140ee6712646f9b19fb04fe26daedd01 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db76b75ede3810e7cf9cfea5067d4f3e0993768b \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <19e42490c89bac9a388f28179e66bebbef350f99 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <531c1aec81bfe19d00af13da5531fbb8209e4bd2 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <719d3932b8f6e3348ce2f0ac58e278301fc17575 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c89477ad79446867394360b29bb801010fc3ff22	47276297140ee6712646f9b19fb04fe26daedd01, db76b75ede3810e7cf9cfea5067d4f3e0993768b, 19e42490c89bac9a388f28179e66bebbef350f99, 531c1aec81bfe19d00af13da5531fbb8209e4bd2, 719d3932b8f6e3348ce2f0ac58e278301fc17575, c89477ad79446867394360b29bb801010fc3ff22

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to db76b75ede3810e7cf9cfea5067d4f3e0993768b; Linux/Linux to 47276297140ee6712646f9b19fb04fe26daedd01 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.