---
id: CVE-2026-23099
title: 'bonding: limit BOND_MODE_8023AD to Ethernet devices'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bonding: limit BOND_MODE_8023AD to Ethernet devices

  BOND_MODE_8023AD makes sense for ARPHRD_ETHER only.

  syzbot reported:

   BUG: KASAN: global-out-of-bounds in __hw_ad…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    19266182b82e9100c799d8a29f5e0452f0bf7703
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    72925dbb0c8c7b16bf922e93c6cc03cbd8c955c4
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    5063b2cd9b27d35ab788d707d7858ded0acc8f1d
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    80c881e53a4fa0a80fa4bef7bc0ead0e8e88940d
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    ef68afb1bee8d35a18896c27d7358079353d8d8a
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    43dee6f7ef1d228821de1b61c292af3744c8d7da
  - >-
    Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 <
    c84fcb79e5dbde0b8d5aeeaf04282d2149aebcf6
  - Linux 2.6.24
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:40:44.652755Z'
published: '2026-02-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:25:30.792Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23099'
references:
  - url: 'https://git.kernel.org/stable/c/19266182b82e9100c799d8a29f5e0452f0bf7703'
  - url: 'https://git.kernel.org/stable/c/72925dbb0c8c7b16bf922e93c6cc03cbd8c955c4'
  - url: 'https://git.kernel.org/stable/c/5063b2cd9b27d35ab788d707d7858ded0acc8f1d'
  - url: 'https://git.kernel.org/stable/c/80c881e53a4fa0a80fa4bef7bc0ead0e8e88940d'
  - url: 'https://git.kernel.org/stable/c/ef68afb1bee8d35a18896c27d7358079353d8d8a'
  - url: 'https://git.kernel.org/stable/c/43dee6f7ef1d228821de1b61c292af3744c8d7da'
  - url: 'https://git.kernel.org/stable/c/c84fcb79e5dbde0b8d5aeeaf04282d2149aebcf6'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.05908
ingestedAt: '2026-10-19T18:35:50.105Z'
---

## Overview

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

bonding: limit BOND_MODE_8023AD to Ethernet devices

BOND_MODE_8023AD makes sense for ARPHRD_ETHER only.

syzbot reported:

 BUG: KASAN: global-out-of-bounds in __hw_addr_create net/core/dev_addr_lists.c:63 [inline]
 BUG: KASAN: global-out-of-bounds in __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118
Read of size 16 at addr ffffffff8bf94040 by task syz.1.3580/19497

CPU: 1 UID: 0 PID: 19497 Comm: syz.1.3580 Tainted: G             L      syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
  dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
  print_address_description mm/kasan/report.c:378 [inline]
  print_report+0xca/0x240 mm/kasan/report.c:482
  kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
  kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
  __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
  __hw_addr_create net/core/dev_addr_lists.c:63 [inline]
  __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118
  __dev_mc_add net/core/dev_addr_lists.c:868 [inline]
  dev_mc_add+0xa1/0x120 net/core/dev_addr_lists.c:886
  bond_enslave+0x2b8b/0x3ac0 drivers/net/bonding/bond_main.c:2180
  do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2963
  do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3165
  rtnl_changelink net/core/rtnetlink.c:3776 [inline]
  __rtnl_newlink net/core/rtnetlink.c:3935 [inline]
  rtnl_newlink+0x161c/0x1c90 net/core/rtnetlink.c:4072
  rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
  netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
  netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
  netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
  netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
  sock_sendmsg_nosec net/socket.c:727 [inline]
  __sock_sendmsg+0x21c/0x270 net/socket.c:742
  ____sys_sendmsg+0x505/0x820 net/socket.c:2592
  ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
  __sys_sendmsg+0x164/0x220 net/socket.c:2678
  do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
  __do_fast_syscall_32+0x1dc/0x560 arch/x86/entry/syscall_32.c:307
  do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
 </TASK>

The buggy address belongs to the variable:
 lacpdu_mcast_addr+0x0/0x40

## Affected

- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < 19266182b82e9100c799d8a29f5e0452f0bf7703`
- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < 72925dbb0c8c7b16bf922e93c6cc03cbd8c955c4`
- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < 5063b2cd9b27d35ab788d707d7858ded0acc8f1d`
- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < 80c881e53a4fa0a80fa4bef7bc0ead0e8e88940d`
- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < ef68afb1bee8d35a18896c27d7358079353d8d8a`
- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < 43dee6f7ef1d228821de1b61c292af3744c8d7da`
- `Linux >= 872254dd6b1f80cb95ee9e2e22980888533fc293 < c84fcb79e5dbde0b8d5aeeaf04282d2149aebcf6`
- `Linux 2.6.24`

## Remediation

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