---
id: CVE-2026-52975
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bonding: 3ad: implement proper RCU rules for port->aggregator

  syzbot found a data-race in bond_3ad_get_active_agg_info /
  bond_3ad_state_machine_handler [1] which hints…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bonding: 3ad: implement proper RCU rules for port->aggregator

  syzbot found a data-race in bond_3ad_get_active_agg_info /
  bond_3ad_state_machine_handler [1] which hints…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
published: '2026-06-24'
updated: '2026-07-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52975'
references:
  - url: 'https://git.kernel.org/stable/c/3b7265b3a82f40d2357c4004b26eb794a095b186'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5fb9ea4e8ebf514d92df2b6c9d0db25ba02ac735'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/78f409fd34fe9de2b24ad8e9dca1b4608a48ed3d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ba2272be04f0cb1e74e1e355ff32ef95df280731'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c169c5837525ad842df6a542facf52b6f866a519'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c4f050ce06c56cfb5993268af4a5cb66ed1cd04e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00139
epssPercentile: 0.0362
ingestedAt: '2026-07-04T12:56:09.612Z'
---

## Overview

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

bonding: 3ad: implement proper RCU rules for port->aggregator

syzbot found a data-race in bond_3ad_get_active_agg_info /
bond_3ad_state_machine_handler [1] which hints at lack of proper
RCU implementation.

Add __rcu qualifier to port->aggregator, and add proper RCU API.

[1]

BUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler

write to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0:
  ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline]
  bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569
  process_one_work kernel/workqueue.c:3302 [inline]
  process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385
  worker_thread+0x58a/0x780 kernel/workqueue.c:3466
  kthread+0x22a/0x280 kernel/kthread.c:436
  ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1:
  __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline]
  bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881
  bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853
  rtnl_link_info_fill net/core/rtnetlink.c:906 [inline]
  rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927
  rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168
  rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453
  rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline]
  rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495
  __dev_notify_flags+0x76/0x390 net/core/dev.c:9790
  netif_change_flags+0xac/0xd0 net/core/dev.c:9823
  do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180
  rtnl_group_changelink net/core/rtnetlink.c:3813 [inline]
  __rtnl_newlink net/core/rtnetlink.c:3981 [inline]
  rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109
  rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995
  netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550
  rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022
  netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
  netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344
  netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894
  sock_sendmsg_nosec net/socket.c:787 [inline]
  __sock_sendmsg net/socket.c:802 [inline]
  ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698
  ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752
  __sys_sendmsg net/socket.c:2784 [inline]
  __do_sys_sendmsg net/socket.c:2789 [inline]
  __se_sys_sendmsg net/socket.c:2787 [inline]
  __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787
  x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff88813cf5c400

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G        W           syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026

## Remediation

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