---
id: CVE-2026-89776
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes

  The VXLAN VNI filter entry policy declares the GROUP/GROUP6 address
  attributes as NLA_BINARY with onl…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes

  The VXLAN VNI filter entry policy declares the GROUP/GROUP6 address
  attributes as NLA_BINARY with onl…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <
    e12c4663529699f457b2988c1dfedf4d13b3b3be
  - >-
    Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <
    47bfcc871576eaef6c8edab6749acd4b317306ea
  - >-
    Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <
    a9ec10815199f9879ba080241dc555efb1daf324
  - >-
    Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <
    daebc7064a1b4c12c98e52c4bceede7f2fcd573c
  - >-
    Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <
    ad32e564c62ebf5ba76dd60a22af52c69d54d17b
  - >-
    Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <
    984f831dda31b3a18f47454cf64989f65402879e
  - Linux 5.18
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T09:17:07.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89776'
references:
  - url: 'https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T08:52:29.596Z'
epss: 0.00205
epssPercentile: 0.10902
---

## Overview

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

vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes

The VXLAN VNI filter entry policy declares the GROUP/GROUP6 address
attributes as NLA_BINARY with only a maximum length, so validate_nla()
accepts a payload shorter than the address. The GROUP consumer reads it
with nla_get_in_addr(), an unconditional 4-byte load, so a short
attribute over-reads up to 3 bytes of uninitialised slab data, which are
stored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing
kernel memory.

Switch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects
any GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is
always sent at full width.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.