CVE-2022-50453

gpiolib: cdev: fix NULL-pointer dereferences

State: Published
Severity: Not scored
Published: Oct 1, 2025
Updated: May 11, 2026
Reserved: Sep 17, 2025

Description

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

gpiolib: cdev: fix NULL-pointer dereferences

There are several places where we can crash the kernel by requesting lines, unbinding the GPIO device, then calling any of the system calls relevant to the GPIO character device's annonymous file descriptors: ioctl(), read(), poll().

While I observed it with the GPIO simulator, it will also happen for any of the GPIO devices that can be hot-unplugged - for instance any HID GPIO expander (e.g. CP2112).

This affects both v1 and v2 uAPI.

This fixes it partially by checking if gdev->chip is not NULL but it doesn't entirely remedy the situation as we still have a race condition in which another thread can remove the device after the check.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d7c51b47ac11e66f547b55640405c1c474642d72 to before 6d79546622baab843172b52c3af035f83c1b21dfAffected d7c51b47ac11e66f547b55640405c1c474642d72 to before 7c755a2d6df511eeb5afba966ac28140f9ea5063Affected d7c51b47ac11e66f547b55640405c1c474642d72 to before d66f68ac9e7ba46b6b90fbe25155723f2126088aAffected d7c51b47ac11e66f547b55640405c1c474642d72 to before ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3Affected d7c51b47ac11e66f547b55640405c1c474642d72 to before 533aae7c94dbc2b14301cfd68ae7e0e90f0c8438Affected
LinuxLinux	4.8Affected before 4.8Not affected 5.10.163 through 5.10.Not affected 5.15.86 through 5.15.Not affected 6.0.16 through 6.0.Not affected 6.1.2 through 6.1.Not affected 6.2 and laterNot affected

Product

Versions

LinuxLinux

d7c51b47ac11e66f547b55640405c1c474642d72 to before 6d79546622baab843172b52c3af035f83c1b21dfAffected
d7c51b47ac11e66f547b55640405c1c474642d72 to before 7c755a2d6df511eeb5afba966ac28140f9ea5063Affected
d7c51b47ac11e66f547b55640405c1c474642d72 to before d66f68ac9e7ba46b6b90fbe25155723f2126088aAffected
d7c51b47ac11e66f547b55640405c1c474642d72 to before ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3Affected
d7c51b47ac11e66f547b55640405c1c474642d72 to before 533aae7c94dbc2b14301cfd68ae7e0e90f0c8438Affected

LinuxLinux

4.8Affected
before 4.8Not affected
5.10.163 through 5.10.*Not affected
5.15.86 through 5.15.*Not affected
6.0.16 through 6.0.*Not affected
6.1.2 through 6.1.*Not affected
6.2 and laterNot affected

References

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