---
id: CVE-2026-53353
title: 'hsr: Remove WARN_ONCE() in hsr_addr_is_self().'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  hsr: Remove WARN_ONCE() in hsr_addr_is_self().

  syzbot reported the warning [0] in hsr_addr_is_self(),
  whose assumption is simply wrong.

  hsr->self_node is cleared in h…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    ff88df6d6a72458e1c4ca0e0342327cafd8317f4
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    4d256cddc47c0c34ffcf7e5205ee4c38863bf457
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    7610e3298aeb2439caa735131265fb634e0db4ec
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    271355c2ef6171dbc815e7ae653eed63444bbd58
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    0232b6fcb7615fb7fecfe0727a23065a53e228b8
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    66a46e22396fd5d09606f37f73643eb20e99aa42
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    d71bb171661ec0225bf4babdd4d296d744982fb3
  - >-
    Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 <
    afd0f17ca46258cec3a5cc48b8df9327fe772490
  - Linux 3.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:27:54.786603Z'
published: '2026-07-01'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:34:22.759Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53353'
references:
  - url: 'https://git.kernel.org/stable/c/ff88df6d6a72458e1c4ca0e0342327cafd8317f4'
  - url: 'https://git.kernel.org/stable/c/4d256cddc47c0c34ffcf7e5205ee4c38863bf457'
  - url: 'https://git.kernel.org/stable/c/7610e3298aeb2439caa735131265fb634e0db4ec'
  - url: 'https://git.kernel.org/stable/c/271355c2ef6171dbc815e7ae653eed63444bbd58'
  - url: 'https://git.kernel.org/stable/c/0232b6fcb7615fb7fecfe0727a23065a53e228b8'
  - url: 'https://git.kernel.org/stable/c/66a46e22396fd5d09606f37f73643eb20e99aa42'
  - url: 'https://git.kernel.org/stable/c/d71bb171661ec0225bf4babdd4d296d744982fb3'
  - url: 'https://git.kernel.org/stable/c/afd0f17ca46258cec3a5cc48b8df9327fe772490'
tags:
  - cve.org
epss: 0.0012
epssPercentile: 0.0188
ingestedAt: '2026-11-05T15:02:32.377Z'
---

## Overview

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

hsr: Remove WARN_ONCE() in hsr_addr_is_self().

syzbot reported the warning [0] in hsr_addr_is_self(),
whose assumption is simply wrong.

hsr->self_node is cleared in hsr_del_self_node(), which
is called from hsr_dellink().

Since dev->rtnl_link_ops->dellink() is called before
unregister_netdevice_many(), there is a window when
user can find the device but without hsr->self_node.

Let's remove WARN_ONCE() in hsr_addr_is_self().

[0]:
HSR: No self node
WARNING: net/hsr/hsr_framereg.c:39 at hsr_addr_is_self+0x211/0x3f0 net/hsr/hsr_framereg.c:39, CPU#0: syz.4.16848/17220
Modules linked in:
CPU: 0 UID: 0 PID: 17220 Comm: syz.4.16848 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:hsr_addr_is_self+0x211/0x3f0 net/hsr/hsr_framereg.c:39
Code: 33 2f 41 0f b7 dd 89 ee 09 de 31 ff e8 c8 b4 c6 f6 09 dd 74 54 e8 0f b0 c6 f6 31 ed eb 53 e8 06 b0 c6 f6 48 8d 3d 2f 50 9c 04 <67> 48 0f b9 3a 31 ed eb 42 e8 c1 13 1f 00 89 c5 31 ff 89 c6 e8 96
RSP: 0018:ffffc900041c70e0 EFLAGS: 00010283
RAX: ffffffff8afdc6ca RBX: ffffffff8afdc4e6 RCX: 0000000000080000
RDX: ffffc90010493000 RSI: 0000000000000948 RDI: ffffffff8f9a1700
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900041c71e8 R11: fffff52000838e3f R12: dffffc0000000000
R13: ffff888041f9e3c0 R14: ffff888086ee3802 R15: 0000000000000000
FS:  00007f6fe985d6c0(0000) GS:ffff888126176000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80bd437dac CR3: 0000000025096000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 check_local_dest net/hsr/hsr_forward.c:592 [inline]
 fill_frame_info net/hsr/hsr_forward.c:728 [inline]
 hsr_forward_skb+0xa11/0x2a80 net/hsr/hsr_forward.c:739
 hsr_dev_xmit+0x253/0x370 net/hsr/hsr_device.c:236
 __netdev_start_xmit include/linux/netdevice.h:5368 [inline]
 netdev_start_xmit include/linux/netdevice.h:5377 [inline]
 xmit_one net/core/dev.c:3888 [inline]
 dev_hard_start_xmit+0x2df/0x860 net/core/dev.c:3904
 __dev_queue_xmit+0x1428/0x3900 net/core/dev.c:4870
 neigh_output include/net/neighbour.h:556 [inline]
 ip_finish_output2+0xcec/0x10b0 net/ipv4/ip_output.c:237
 ip_send_skb net/ipv4/ip_output.c:1510 [inline]
 ip_push_pending_frames+0x8b/0x110 net/ipv4/ip_output.c:1530
 raw_sendmsg+0x1547/0x1a50 net/ipv4/raw.c:659
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0x7da/0x9c0 net/socket.c:2698
 ___sys_sendmsg+0x2a5/0x360 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+0x1c3/0x2a0 net/socket.c:2787
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6feb62ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6fe985d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6feb8a6090 RCX: 00007f6feb62ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f6feb6c2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6feb8a6128 R14: 00007f6feb8a6090 R15: 00007ffcf01cc488
 </TASK>

## Affected

- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < ff88df6d6a72458e1c4ca0e0342327cafd8317f4`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 4d256cddc47c0c34ffcf7e5205ee4c38863bf457`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 7610e3298aeb2439caa735131265fb634e0db4ec`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 271355c2ef6171dbc815e7ae653eed63444bbd58`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 0232b6fcb7615fb7fecfe0727a23065a53e228b8`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 66a46e22396fd5d09606f37f73643eb20e99aa42`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < d71bb171661ec0225bf4babdd4d296d744982fb3`
- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < afd0f17ca46258cec3a5cc48b8df9327fe772490`
- `Linux 3.17`

## Remediation

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