---
id: CVE-2023-53524
title: 'wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf

  An integer overflow occurs in the iwl_write_to_user_buf() function,
  which is called by the iwl_dbgfs…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <
    0ad8dd870aa187d0c21d032bb2c6433559075eec
  - >-
    Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <
    059e426d666a41e26b184c177c1ca3ee2d6fa1b6
  - >-
    Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <
    82f877ec9b041edc4c7c509c605cc3393d837bf0
  - >-
    Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <
    eb1ef44efac797b384d361a76e33f77027c29a14
  - >-
    Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <
    de78456976026102babe66258c228691ca5677c0
  - >-
    Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <
    58d1b717879bfeabe09b35e41ad667c79933eb2e
  - Linux 5.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:23:14.529998Z'
published: '2025-10-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:31:13.586Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53524'
references:
  - url: 'https://git.kernel.org/stable/c/0ad8dd870aa187d0c21d032bb2c6433559075eec'
  - url: 'https://git.kernel.org/stable/c/059e426d666a41e26b184c177c1ca3ee2d6fa1b6'
  - url: 'https://git.kernel.org/stable/c/82f877ec9b041edc4c7c509c605cc3393d837bf0'
  - url: 'https://git.kernel.org/stable/c/eb1ef44efac797b384d361a76e33f77027c29a14'
  - url: 'https://git.kernel.org/stable/c/de78456976026102babe66258c228691ca5677c0'
  - url: 'https://git.kernel.org/stable/c/58d1b717879bfeabe09b35e41ad667c79933eb2e'
tags:
  - cve.org
epss: 0.00173
epssPercentile: 0.06778
ingestedAt: '2026-11-05T22:38:31.808Z'
---

## Overview

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

wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf

An integer overflow occurs in the iwl_write_to_user_buf() function,
which is called by the iwl_dbgfs_monitor_data_read() function.

static bool iwl_write_to_user_buf(char __user *user_buf, ssize_t count,
				  void *buf, ssize_t *size,
				  ssize_t *bytes_copied)
{
	int buf_size_left = count - *bytes_copied;

	buf_size_left = buf_size_left - (buf_size_left % sizeof(u32));
	if (*size > buf_size_left)
		*size = buf_size_left;

If the user passes a SIZE_MAX value to the "ssize_t count" parameter,
the ssize_t count parameter is assigned to "int buf_size_left".
Then compare "*size" with "buf_size_left" . Here, "buf_size_left" is a
negative number, so "*size" is assigned "buf_size_left" and goes into
the third argument of the copy_to_user function, causing a heap overflow.

This is not a security vulnerability because iwl_dbgfs_monitor_data_read()
is a debugfs operation with 0400 privileges.

## Affected

- `Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 < 0ad8dd870aa187d0c21d032bb2c6433559075eec`
- `Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 < 059e426d666a41e26b184c177c1ca3ee2d6fa1b6`
- `Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 < 82f877ec9b041edc4c7c509c605cc3393d837bf0`
- `Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 < eb1ef44efac797b384d361a76e33f77027c29a14`
- `Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 < de78456976026102babe66258c228691ca5677c0`
- `Linux >= f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 < 58d1b717879bfeabe09b35e41ad667c79933eb2e`
- `Linux 5.0`

## Remediation

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