CVE-2023-53472
pwm: lpc32xx: Remove handling of PWM channels
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
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.
This update provides the initial livepatch for this kernel update. This update does not contain any fixes and will be updated with livepatches later.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2025-10-01 CVE Reserved
- 2025-10-01 CVE Published
- 2025-10-02 CVE Updated
- 2026-02-27 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (15)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/bb4de81eb940e7027f37a6fd3b7ddcb4403deb56 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/4459118977665f681017e1299933895d54b6e87b | Vuln. Introduced | |
| https://git.kernel.org/stable/c/81e6b51709da162b94e40a445bb60856406beaa1 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/322b70b522abe03cd59712bb47a72eddd835d19d | Vuln. Introduced | |
| https://git.kernel.org/stable/c/3d2813fb17e5fd0d73c1d1442ca0192bde4af10e | Vuln. Introduced | |
| https://git.kernel.org/stable/c/7fc2172ad4e701d3c6e7dcb7b2efd8df71d2417b | Vuln. Introduced | |
| https://git.kernel.org/stable/c/1c90a357cef4219cb436e59cc7463888103e104b | Vuln. Introduced |
| URL | Date | SRC |
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| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14.248 < 4.14.326 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14.248 < 4.14.326" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19.208 < 4.19.295 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.208 < 4.19.295" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.4.149 < 5.4.257 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.149 < 5.4.257" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.10.69 < 5.10.195 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10.69 < 5.10.195" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.15 < 5.15.132 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.15.132" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.15 < 6.1.54 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.1.54" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.15 < 6.5.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.5.4" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.15 < 6.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.6" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.9.284 Search vendor "Linux" for product "Linux Kernel" and version "4.9.284" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 5.14.8 Search vendor "Linux" for product "Linux Kernel" and version "5.14.8" | en |
Affected
| ||||||