CVE-2026-46266

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP

CRITICAL 9.1

At a glance

Source
NVD
EPSS
EPSS 0.46 % · percentile 40 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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.

Weaknesses (CWE)

  • CWE-20 — Improper Input Validation

References

Scores

VersionScoreVectorScored by
CVSS 3.1CRITICAL 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HLinux
CVSS 3.1CRITICAL 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 47276297140ee6712646f9b19fb04fe26daedd01 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < db76b75ede3810e7cf9cfea5067d4f3e0993768b ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 19e42490c89bac9a388f28179e66bebbef350f99 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 531c1aec81bfe19d00af13da5531fbb8209e4bd2 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 719d3932b8f6e3348ce2f0ac58e278301fc17575 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c89477ad79446867394360b29bb801010fc3ff22
Linux · Linuxaffected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 6.1.187 ≤ 6.1.* ; unaffected 6.6.128 ≤ 6.6.* ; unaffected 6.12.75 ≤ 6.12.* ; unaffected 6.18.14 ≤ 6.18.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD