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🛡️ CVE-2026-23126 — kernel

🟡 CVSS 4.7 — Medium ✅ No Known Exploit NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-23126 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.18.8)
  • linux-kernel

Timeline and source

Published on 14 February 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-23126 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-02-14
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.18.8
linux-kernel — —

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