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CVE-2026-23126

Updated on 14 Feb 2026

Severity

4.7 Medium severity

Details

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 ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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] [ 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]

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

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , Debian 10 ELS , Oracle Linux 7 ELS , TuxCare 9.6 ESU , Ubuntu 20.04 ELS
Affected packages:
linux @ 4.19.0 (+8 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 9.2 ESU Planned —
AlmaLinux 9.6 ESU Planned —
Amazon Linux 2023 Released
46 kernels
  • 6.1.79-99.164.amzn2023
  • 6.1.84-99.169.amzn2023
  • 6.1.82-99.168.amzn2023
  • 6.1.90-99.173.amzn2023
  • 6.1.87-99.174.amzn2023
  • 6.1.91-99.172.amzn2023
  • 6.1.97-104.177.amzn2023
  • 6.1.94-99.176.amzn2023
  • 6.1.102-108.177.amzn2023
  • 6.1.106-116.188.amzn2023
  • 6.1.102-111.182.amzn2023
  • 6.1.79-99.167.amzn2023
  • 6.1.92-99.174.amzn2023
  • 6.1.96-102.177.amzn2023
  • 6.1.109-118.189.amzn2023
  • 6.1.112-122.189.amzn2023
  • 6.1.111-120.187.amzn2023
  • 6.1.115-126.197.amzn2023
  • 6.1.119-129.201.amzn2023
  • 6.1.124-134.200.amzn2023
  • 6.1.127-135.201.amzn2023
  • 6.1.128-136.201.amzn2023
  • 6.1.129-138.220.amzn2023
  • 6.1.130-139.222.amzn2023
  • 6.1.131-143.221.amzn2023
  • 6.1.132-147.221.amzn2023
  • 6.1.134-150.224.amzn2023
  • 6.1.112-124.190.amzn2023
  • 6.1.140-154.222.amzn2023
  • 6.1.141-155.222.amzn2023
  • 6.1.134-152.225.amzn2023
  • 6.1.144-170.251.amzn2023
  • 6.1.147-172.266.amzn2023
  • 6.1.148-173.267.amzn2023
  • 6.1.150-174.273.amzn2023
  • 6.1.141-165.249.amzn2023
  • 6.1.141-167.250.amzn2023
  • 6.1.147-172.259.amzn2023
  • 6.1.153-175.280.amzn2023
  • 6.1.155-176.282.amzn2023
  • 6.1.156-177.286.amzn2023
  • 6.1.158-178.288.amzn2023
  • 6.1.159-181.297.amzn2023
  • 6.1.158-180.294.amzn2023
  • 6.1.159-182.297.amzn2023
  • 6.1.161-183.298.amzn2023
Debian 13 Planned —
Ubuntu 24.04 Planned —
Ubuntu 24.04 AWS Planned —