---
id: CVE-2023-52454
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length

  If the host sends an H2CData command with an invalid DATAL,
  the kernel may crash in nvmet_tcp_b…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length

  If the host sends an H2CData command with an invalid DATAL,
  the kernel may crash in nvmet_tcp_b…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.0.0, < 5.4.268'
  - 'linux_kernel >= 5.5.0, < 5.10.209'
  - 'linux_kernel >= 5.11.0, < 5.15.148'
  - 'linux_kernel >= 5.16.0, < 6.1.75'
  - 'linux_kernel >= 6.2.0, < 6.6.14'
  - 'linux_kernel >= 6.7.0, < 6.7.2'
patched:
  - linux_kernel 6.7.2
published: '2024-02-23'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-52454'
references:
  - url: 'https://git.kernel.org/stable/c/24e05760186dc070d3db190ca61efdbce23afc88'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2871aa407007f6f531fae181ad252486e022df42'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/70154e8d015c9b4fb56c1a2ef1fc8b83d45c7f68'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ee5e7632e981673f42a50ade25e71e612e543d9d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/efa56305908ba20de2104f1b8508c6a7401833be'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f775f2621c2ac5cc3a0b3a64665dad4fb146e510'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/24e05760186dc070d3db190ca61efdbce23afc88'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/2871aa407007f6f531fae181ad252486e022df42'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/4cb3cf7177ae3666be7fb27d4ad4d72a295fb02d'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/70154e8d015c9b4fb56c1a2ef1fc8b83d45c7f68'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/ee5e7632e981673f42a50ade25e71e612e543d9d'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/efa56305908ba20de2104f1b8508c6a7401833be'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/f775f2621c2ac5cc3a0b3a64665dad4fb146e510'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00676
epssPercentile: 0.50163
ingestedAt: '2026-08-04T10:39:37.944Z'
---

## Overview

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

nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length

If the host sends an H2CData command with an invalid DATAL,
the kernel may crash in nvmet_tcp_build_pdu_iovec().

Unable to handle kernel NULL pointer dereference at
virtual address 0000000000000000
lr : nvmet_tcp_io_work+0x6ac/0x718 [nvmet_tcp]
Call trace:
  process_one_work+0x174/0x3c8
  worker_thread+0x2d0/0x3e8
  kthread+0x104/0x110

Fix the bug by raising a fatal error if DATAL isn't coherent
with the packet size.
Also, the PDU length should never exceed the MAXH2CDATA parameter which
has been communicated to the host in nvmet_tcp_handle_icreq().

## Affected

- `linux_kernel >= 5.0.0, < 5.4.268`
- `linux_kernel >= 5.5.0, < 5.10.209`
- `linux_kernel >= 5.11.0, < 5.15.148`
- `linux_kernel >= 5.16.0, < 6.1.75`
- `linux_kernel >= 6.2.0, < 6.6.14`
- `linux_kernel >= 6.7.0, < 6.7.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.7.2`