---
id: CVE-2022-50151
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: cdns3: fix random warning message when driver load

  Warning log:
  [    4.141392] Unexpected gfp: 0x4 (GFP_DMA32)
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  usb: cdns3: fix random warning message when driver load


  Warning log:

  [    4.141392] Unexpected gfp: 0x4 (GFP_DMA32). Fixing up to gfp: 0xa20
  (GFP_ATOMIC). Fix your cod…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.3, < 5.15.63'
  - 'linux_kernel >= 5.16, < 5.19.2'
patched:
  - linux_kernel 5.19.2
published: '2025-06-18'
updated: '2026-08-15'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-50151'
references:
  - url: 'https://git.kernel.org/stable/c/8659ab3d936fcf0084676f98b75b317017aa8f82'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8e142744f0e96abc69ccd99e6d6c7eb662267f21'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/960a8a35a6027a08c4b511435bf59609b5d5e5cd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00197
epssPercentile: 0.08317
ingestedAt: '2026-08-15T13:26:45.103Z'
---

## Overview

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

usb: cdns3: fix random warning message when driver load

Warning log:
[    4.141392] Unexpected gfp: 0x4 (GFP_DMA32). Fixing up to gfp: 0xa20 (GFP_ATOMIC). Fix your code!
[    4.150340] CPU: 1 PID: 175 Comm: 1-0050 Not tainted 5.15.5-00039-g2fd9ae1b568c #20
[    4.158010] Hardware name: Freescale i.MX8QXP MEK (DT)
[    4.163155] Call trace:
[    4.165600]  dump_backtrace+0x0/0x1b0
[    4.169286]  show_stack+0x18/0x68
[    4.172611]  dump_stack_lvl+0x68/0x84
[    4.176286]  dump_stack+0x18/0x34
[    4.179613]  kmalloc_fix_flags+0x60/0x88
[    4.183550]  new_slab+0x334/0x370
[    4.186878]  ___slab_alloc.part.108+0x4d4/0x748
[    4.191419]  __slab_alloc.isra.109+0x30/0x78
[    4.195702]  kmem_cache_alloc+0x40c/0x420
[    4.199725]  dma_pool_alloc+0xac/0x1f8
[    4.203486]  cdns3_allocate_trb_pool+0xb4/0xd0

pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags)
{
	...
	page = kmalloc(sizeof(*page), mem_flags);
	page->vaddr = dma_alloc_coherent(pool->dev, pool->allocation,
					 &page->dma, mem_flags);
	...
}

kmalloc was called with mem_flags, which is passed down in
cdns3_allocate_trb_pool() and have GFP_DMA32 flags.
kmall_fix_flags() report warning.

GFP_DMA32 is not useful at all. dma_alloc_coherent() will handle
DMA memory region correctly by pool->dev. GFP_DMA32 can be removed
safely.

## Affected

- `linux_kernel >= 5.3, < 5.15.63`
- `linux_kernel >= 5.16, < 5.19.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.19.2`