---
id: CVE-2026-43449
title: 'nvme-pci: Fix slab-out-of-bounds in nvme_dbbuf_set'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nvme-pci: Fix slab-out-of-bounds in nvme_dbbuf_set

  dev->online_queues is a count incremented in nvme_init_queue. Thus,
  valid indices are 0 through dev->online_queues −…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    2b9d605c3f0d3262142f196249cd3bd58c857c71
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    86183d550559e45e07059bbdf17331fea469e38c
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    d7990c936e25f484b61a5adeeadc1d290a9fd16e
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    83e6edd6358326c9c2de31a54bb4a1ec50703f1f
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    50bad78f03a02d3c0f228edf9912b494d3e7acb9
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    328c551f0cc81ee776b186b86cc6e5253bb6fda7
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    78279d2d74c58a0ed64e43cf601a02649771182e
  - >-
    Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <
    b4e78f1427c7d6859229ae9616df54e1fc05a516
  - Linux 930bb3092fe606baa23d57ae59b70b291d67a8af
  - Linux fd1c1de8c4589fdd528733bfd01ed0c5f3f69204
  - Linux 4940816604e3ce7e05e8df297773ee86c0476d48
  - Linux 55a3b1ad694631cc2698b5500ac5865d7d0f064e
  - Linux >= 4.14.210 < 4.15
  - Linux >= 4.19.161 < 4.20
  - Linux >= 5.4.81 < 5.5
  - Linux >= 5.9.12 < 5.10
  - Linux 5.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:39:10.452797Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:55.046Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43449'
references:
  - url: 'https://git.kernel.org/stable/c/2b9d605c3f0d3262142f196249cd3bd58c857c71'
  - url: 'https://git.kernel.org/stable/c/86183d550559e45e07059bbdf17331fea469e38c'
  - url: 'https://git.kernel.org/stable/c/d7990c936e25f484b61a5adeeadc1d290a9fd16e'
  - url: 'https://git.kernel.org/stable/c/83e6edd6358326c9c2de31a54bb4a1ec50703f1f'
  - url: 'https://git.kernel.org/stable/c/50bad78f03a02d3c0f228edf9912b494d3e7acb9'
  - url: 'https://git.kernel.org/stable/c/328c551f0cc81ee776b186b86cc6e5253bb6fda7'
  - url: 'https://git.kernel.org/stable/c/78279d2d74c58a0ed64e43cf601a02649771182e'
  - url: 'https://git.kernel.org/stable/c/b4e78f1427c7d6859229ae9616df54e1fc05a516'
tags:
  - cve.org
epss: 0.00126
epssPercentile: 0.02325
ingestedAt: '2026-11-06T15:54:03.907Z'
---

## Overview

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

nvme-pci: Fix slab-out-of-bounds in nvme_dbbuf_set

dev->online_queues is a count incremented in nvme_init_queue. Thus,
valid indices are 0 through dev->online_queues − 1.

This patch fixes the loop condition to ensure the index stays within the
valid range. Index 0 is excluded because it is the admin queue.

KASAN splat:

==================================================================
BUG: KASAN: slab-out-of-bounds in nvme_dbbuf_free drivers/nvme/host/pci.c:377 [inline]
BUG: KASAN: slab-out-of-bounds in nvme_dbbuf_set+0x39c/0x400 drivers/nvme/host/pci.c:404
Read of size 2 at addr ffff88800592a574 by task kworker/u8:5/74

CPU: 0 UID: 0 PID: 74 Comm: kworker/u8:5 Not tainted 6.19.0-dirty #10 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
Workqueue: nvme-reset-wq nvme_reset_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xea/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xce/0x5d0 mm/kasan/report.c:482
 kasan_report+0xdc/0x110 mm/kasan/report.c:595
 __asan_report_load2_noabort+0x18/0x20 mm/kasan/report_generic.c:379
 nvme_dbbuf_free drivers/nvme/host/pci.c:377 [inline]
 nvme_dbbuf_set+0x39c/0x400 drivers/nvme/host/pci.c:404
 nvme_reset_work+0x36b/0x8c0 drivers/nvme/host/pci.c:3252
 process_one_work+0x956/0x1aa0 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x65c/0xe60 kernel/workqueue.c:3421
 kthread+0x41a/0x930 kernel/kthread.c:463
 ret_from_fork+0x6f8/0x8c0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Allocated by task 34 on cpu 1 at 4.241550s:
 kasan_save_stack+0x2c/0x60 mm/kasan/common.c:57
 kasan_save_track+0x1c/0x70 mm/kasan/common.c:78
 kasan_save_alloc_info+0x3c/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xb5/0xc0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5657 [inline]
 __kmalloc_node_noprof+0x2bf/0x8d0 mm/slub.c:5663
 kmalloc_array_node_noprof include/linux/slab.h:1075 [inline]
 nvme_pci_alloc_dev drivers/nvme/host/pci.c:3479 [inline]
 nvme_probe+0x2f1/0x1820 drivers/nvme/host/pci.c:3534
 local_pci_probe+0xef/0x1c0 drivers/pci/pci-driver.c:324
 pci_call_probe drivers/pci/pci-driver.c:392 [inline]
 __pci_device_probe drivers/pci/pci-driver.c:417 [inline]
 pci_device_probe+0x743/0x920 drivers/pci/pci-driver.c:451
 call_driver_probe drivers/base/dd.c:583 [inline]
 really_probe+0x29b/0xb70 drivers/base/dd.c:661
 __driver_probe_device+0x3b0/0x4a0 drivers/base/dd.c:803
 driver_probe_device+0x56/0x1f0 drivers/base/dd.c:833
 __driver_attach_async_helper+0x155/0x340 drivers/base/dd.c:1159
 async_run_entry_fn+0xa6/0x4b0 kernel/async.c:129
 process_one_work+0x956/0x1aa0 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x65c/0xe60 kernel/workqueue.c:3421
 kthread+0x41a/0x930 kernel/kthread.c:463
 ret_from_fork+0x6f8/0x8c0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

The buggy address belongs to the object at ffff88800592a000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 244 bytes to the right of
 allocated 1152-byte region [ffff88800592a000, ffff88800592a480)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5928
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfffffc0000040(head|node=0|zone=1|lastcpupid=0x1fffff)
page_type: f5(slab)
raw: 000fffffc0000040 ffff888001042000 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 000fffffc0000040 ffff888001042000 00000
---truncated---

## Affected

- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < 2b9d605c3f0d3262142f196249cd3bd58c857c71`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < 86183d550559e45e07059bbdf17331fea469e38c`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < d7990c936e25f484b61a5adeeadc1d290a9fd16e`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < 83e6edd6358326c9c2de31a54bb4a1ec50703f1f`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < 50bad78f03a02d3c0f228edf9912b494d3e7acb9`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < 328c551f0cc81ee776b186b86cc6e5253bb6fda7`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < 78279d2d74c58a0ed64e43cf601a02649771182e`
- `Linux >= 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf < b4e78f1427c7d6859229ae9616df54e1fc05a516`
- `Linux 930bb3092fe606baa23d57ae59b70b291d67a8af`
- `Linux fd1c1de8c4589fdd528733bfd01ed0c5f3f69204`
- `Linux 4940816604e3ce7e05e8df297773ee86c0476d48`
- `Linux 55a3b1ad694631cc2698b5500ac5865d7d0f064e`
- `Linux >= 4.14.210 < 4.15`
- `Linux >= 4.19.161 < 4.20`
- `Linux >= 5.4.81 < 5.5`
- `Linux >= 5.9.12 < 5.10`
- `Linux 5.10`

## Remediation

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