SB2026060414 - Improper input validation in Linux kernel ipv6

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Main Vulnerability Database SB2026060414

SB2026060414 - Improper input validation in Linux kernel ipv6

Published: June 4, 2026

Security Bulletin ID SB2026060414
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-46266)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to alter forwarding and path MTU exception handling state.

The vulnerability exists due to improper input validation in RAW socket handling in the IPv4 and IPv6 ICMP error delivery paths when processing malicious incoming ICMP packets with an embedded packet header using protocol 255. A remote attacker can send a specially crafted ICMP packet to alter forwarding and path MTU exception handling state.

Exploitation requires the presence of a RAW socket created with IPPROTO_RAW.


Remediation

Install update from vendor's website.

References