PT-2026-51869 · Linux · Linux

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-52975

Mitre

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

Related Identifiers

CVE-2026-52975

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-52975 · Security Note
• https://git.kernel.org/stable/c/3b7265b3a82f40d2357c4004b26eb794a095b186 · Note
• https://git.kernel.org/stable/c/c4f050ce06c56cfb5993268af4a5cb66ed1cd04e · Note
• https://git.kernel.org/stable/c/c169c5837525ad842df6a542facf52b6f866a519 · Note
• https://git.kernel.org/stable/c/78f409fd34fe9de2b24ad8e9dca1b4608a48ed3d · Note
• https://git.kernel.org/stable/c/ba2272be04f0cb1e74e1e355ff32ef95df280731 · Note