CVE-2026-31682 CRITICAL

CVE-2026-31682: bridge: br_nd_send: linearize skb before parsing ND options

Vendor Linux
Product Linux
Published April 25, 2026
Last update May 11, 2026

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

What the vulnerability does

01Description

In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.

Key dates

02Disclosure timeline

April 25, 2026 CVE published
May 11, 2026 Record updated