9.1

CVE-2026-46266: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP

Modified
AliasesUBUNTU-CVE-2026-46266DEBIAN-CVE-2026-46266
Published 03-06-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-46266 is a critical (CVSS 9.1) Improper Input Validation vulnerability in linux. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 40.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · -0.24 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 58 · Related 60
OPENSUSE-SU-2026:21388-1RHSA-2026:64775RHSA-2026:66180RHSA-2026:68531RHSA-2026:68532SUSE-SU-2026:22521-1

Timeline

  1. 03-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

Decrease -0.24 pp

From 0.70% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linux< 3.13.0-215.266 | < 4.4.0-284.318 | < 4.15.0-254.266 | < 5.4.0-234.254 | < 5.15.0-187.197 | < 6.8.0-134.134 | < 6.17.0-40.40
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1157.163 | < 4.4.0-1195.210 | < 4.15.0-1195.208 | < 5.4.0-1162.173 | < 5.15.0-1113.120 | < 6.8.0-1060.63 | < 6.17.0-1019.19
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 47276297140ee6712646f9b19fb04fe26daedd01 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < db76b75ede3810e7cf9cfea5067d4f3e0993768b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 19e42490c89bac9a388f28179e66bebbef350f99 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 531c1aec81bfe19d00af13da5531fbb8209e4bd2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 719d3932b8f6e3348ce2f0ac58e278301fc17575 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c89477ad79446867394360b29bb801010fc3ff22 | 2.6.12
  • linux_kernel≥ 2.6.12.1, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.14 | ≥ 6.19, < 6.19.4 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5
Debian1 product
  • linux< 6.1.187-1 | < 6.12.85-1 | < 6.18.14-1

3 vendors · 160 products

References

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