---
id: CVE-2026-23126
title: 'netdevsim: fix a race issue related to the operation on bpf_bound_progs list'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netdevsim: fix a race issue related to the operation on bpf_bound_progs list

  The netdevsim driver lacks a protection mechanism for operations on the
  bpf_bound_progs li…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 <
    3f560cfc7706029294132482fff5d1bc7884b70d
  - >-
    Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 <
    f1f9cfd2f46a73b7de2982d01be822eac3a0efaa
  - >-
    Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 <
    d77379ca82efcb2fe563359cc795027d680410db
  - >-
    Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 <
    68462ecc40ea8f780fb3c74ebfddd05506bb731b
  - >-
    Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 <
    b97d5eedf4976cc94321243be83b39efe81a0e15
  - Linux 4.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:41:30.500855Z'
published: '2026-02-14'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:25:32.555Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23126'
references:
  - url: 'https://git.kernel.org/stable/c/3f560cfc7706029294132482fff5d1bc7884b70d'
  - url: 'https://git.kernel.org/stable/c/f1f9cfd2f46a73b7de2982d01be822eac3a0efaa'
  - url: 'https://git.kernel.org/stable/c/d77379ca82efcb2fe563359cc795027d680410db'
  - url: 'https://git.kernel.org/stable/c/68462ecc40ea8f780fb3c74ebfddd05506bb731b'
  - url: 'https://git.kernel.org/stable/c/b97d5eedf4976cc94321243be83b39efe81a0e15'
tags:
  - cve.org
epss: 0.00098
epssPercentile: 0.0074
ingestedAt: '2026-10-19T18:35:50.101Z'
---

## Overview

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

netdevsim: fix a race issue related to the operation on bpf_bound_progs list

The netdevsim driver lacks a protection mechanism for operations on the
bpf_bound_progs list. When the nsim_bpf_create_prog() performs
list_add_tail, it is possible that nsim_bpf_destroy_prog() is
simultaneously performs list_del. Concurrent operations on the list may
lead to list corruption and trigger a kernel crash as follows:

[  417.290971] kernel BUG at lib/list_debug.c:62!
[  417.290983] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[  417.290992] CPU: 10 PID: 168 Comm: kworker/10:1 Kdump: loaded Not tainted 6.19.0-rc5 #1
[  417.291003] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  417.291007] Workqueue: events bpf_prog_free_deferred
[  417.291021] RIP: 0010:__list_del_entry_valid_or_report+0xa7/0xc0
[  417.291034] Code: a8 ff 0f 0b 48 89 fe 48 89 ca 48 c7 c7 48 a1 eb ae e8 ed fb a8 ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 80 a1 eb ae e8 d9 fb a8 ff <0f> 0b 48 89 d1 48 c7 c7 d0 a1 eb ae 48 89 f2 48 89 c6 e8 c2 fb a8
[  417.291040] RSP: 0018:ffffb16a40807df8 EFLAGS: 00010246
[  417.291046] RAX: 000000000000006d RBX: ffff8e589866f500 RCX: 0000000000000000
[  417.291051] RDX: 0000000000000000 RSI: ffff8e59f7b23180 RDI: ffff8e59f7b23180
[  417.291055] RBP: ffffb16a412c9000 R08: 0000000000000000 R09: 0000000000000003
[  417.291059] R10: ffffb16a40807c80 R11: ffffffffaf9edce8 R12: ffff8e594427ac20
[  417.291063] R13: ffff8e59f7b44780 R14: ffff8e58800b7a05 R15: 0000000000000000
[  417.291074] FS:  0000000000000000(0000) GS:ffff8e59f7b00000(0000) knlGS:0000000000000000
[  417.291079] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  417.291083] CR2: 00007fc4083efe08 CR3: 00000001c3626006 CR4: 0000000000770ee0
[  417.291088] PKRU: 55555554
[  417.291091] Call Trace:
[  417.291096]  <TASK>
[  417.291103]  nsim_bpf_destroy_prog+0x31/0x80 [netdevsim]
[  417.291154]  __bpf_prog_offload_destroy+0x2a/0x80
[  417.291163]  bpf_prog_dev_bound_destroy+0x6f/0xb0
[  417.291171]  bpf_prog_free_deferred+0x18e/0x1a0
[  417.291178]  process_one_work+0x18a/0x3a0
[  417.291188]  worker_thread+0x27b/0x3a0
[  417.291197]  ? __pfx_worker_thread+0x10/0x10
[  417.291207]  kthread+0xe5/0x120
[  417.291214]  ? __pfx_kthread+0x10/0x10
[  417.291221]  ret_from_fork+0x31/0x50
[  417.291230]  ? __pfx_kthread+0x10/0x10
[  417.291236]  ret_from_fork_asm+0x1a/0x30
[  417.291246]  </TASK>

Add a mutex lock, to prevent simultaneous addition and deletion operations
on the list.

## Affected

- `Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 < 3f560cfc7706029294132482fff5d1bc7884b70d`
- `Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 < f1f9cfd2f46a73b7de2982d01be822eac3a0efaa`
- `Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 < d77379ca82efcb2fe563359cc795027d680410db`
- `Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 < 68462ecc40ea8f780fb3c74ebfddd05506bb731b`
- `Linux >= 31d3ad832948c75139b0e5b653912f7898a1d5d5 < b97d5eedf4976cc94321243be83b39efe81a0e15`
- `Linux 4.16`

## Remediation

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