CVE-2023-53472

low-risk
Published 2025-10-01

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (8)

Patch https://git.kernel.org/stable/c/04301da4d87067a989f70ee56942bf9d97cd2a45
Patch https://git.kernel.org/stable/c/4aae44f65827f0213a7361cf9c32cfe06114473f
Patch https://git.kernel.org/stable/c/523f6268e86552a048975749251184c4e9a4b38f
Patch https://git.kernel.org/stable/c/5e22217c11424ef958ba28d03ff7167b4d7a8914
Patch https://git.kernel.org/stable/c/a2d9d884e84bfd37892219b1f55847f36d8e9901
Patch https://git.kernel.org/stable/c/a9a505f5b39d8fff1a55963a5e524c84639e98b2
Patch https://git.kernel.org/stable/c/abd9b2ee4047ccd980decbf26d61f9637604b1d5
Patch https://git.kernel.org/stable/c/e3a0ddbaf7f1f9ffc070718b417461ced3268758
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal