CVE-2026-31674 HIGH

CVE-2026-31674: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()

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

CVSS base score

7.1/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.

Key dates

02Disclosure timeline

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