CVE-2026-46266

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-03. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

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
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

June 3, 2026

Last Modified

September 2, 2026

Advisory Details (6)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b
generic

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22
generic

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575
generic

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2
generic

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01
generic

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99

Vendor Advisories for CVE-2026-46266(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oem-6.17 (6.17.0-1028.28) @ noble2026-09-14ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-hwe-24.04 (6.17.0-1026.26) @ noble2026-09-14ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1017.19) @ questing2026-09-14ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-virtual-hwe-24.04 (6.17.0-40.40~24.04.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1021.21) @ questing2026-09-14ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1021.21~24.04.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.17 (6.17.0-1018.18~24.04.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1076 (5.15.0-1076.80) @ jammy2026-09-14ubuntu
ubuntulinux-virtual (3.13.0.215.225) @ trusty2026-09-14ubuntu
ubuntulinux-tools-kvm-5.4 (5.4.0.1149.145) @ focal2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1080 (5.4.0-1080.84) @ focal2026-09-14ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.254.266~16.04.1) @ xenial2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure (4.15.0.1205.220~14.04.1) @ trusty2026-09-14ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1110.106) @ jammy2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1054.56) @ jammy2026-09-14ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1118.127~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-oracle (4.15.0.1158.169~16.04.1) @ xenial2026-09-14ubuntu
redhatkernel-0:5.14.0-687.46.1.el9_82026-09-10redhat
redhatkernel-0:6.12.0-211.52.1.el10_22026-09-08redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)6.1.187-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

Additional Vendor Advisories

(23)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Frequently asked(5)

What is CVE-2026-46266?
CVE-2026-46266 is a critical vulnerability published on June 3, 2026. 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(AFINET, SOCKRAW, 255); A malicious incoming ICMP packet can set…
When was CVE-2026-46266 disclosed?
CVE-2026-46266 was first published in the National Vulnerability Database on June 3, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46266 actively exploited?
CVE-2026-46266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.0% of all scored CVEs.
What is the CVSS score of CVE-2026-46266?
CVE-2026-46266 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-46266?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46266, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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