PT-2026-43904 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-46037

Mitre

CVSS v3.1

8.2

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

In the Linux kernel, the following vulnerability has been resolved:

ipv4: icmp: validate reply type before using icmp pointers

Extended echo replies use ICMP EXT ECHOREPLY as the outbound reply type. That value is outside the range covered by icmp pointers[], which only describes the traditional ICMP types up to NR ICMP TYPES.

Avoid consulting icmp pointers[] for reply types outside that range, and use array index nospec() for the remaining in-range lookup. Normal ICMP replies keep their existing behavior unchanged.

Fix

Related Identifiers

CVE-2026-46037

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46037 · Security Note
• https://git.kernel.org/stable/c/d700c34a5d186b9ba0715bcb19e0ff80ffbfbfc1 · Note
• https://git.kernel.org/stable/c/67bf002a2d7387a6312138210d0bd06e3cf4879b · Note
• https://git.kernel.org/stable/c/bc64a66e0b9ad937d3d49934242ee62b01ba9a94 · Note
• https://git.kernel.org/stable/c/c2178ff1c70ebfc2ab9651b230c58a34683db759 · Note
• https://git.kernel.org/stable/c/92e7c209036dcc0e8ffdf806fdfd3645b263bea5 · Note