CVE-2022-50453

published 2025-10-01

CVE-2022-50453: In the Linux kernel, the following vulnerability has been resolved: gpiolib: cdev: fix NULL-pointer dereferences There are several places where we can crash…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= d7c51b47ac11e66f547b55640405c1c474642d72 < 6d79546622baab843172b52c3af035f83c1b21df	6d79546622baab843172b52c3af035f83c1b21df
linux	linux	>= d7c51b47ac11e66f547b55640405c1c474642d72 < 7c755a2d6df511eeb5afba966ac28140f9ea5063	7c755a2d6df511eeb5afba966ac28140f9ea5063
linux	linux	>= d7c51b47ac11e66f547b55640405c1c474642d72 < d66f68ac9e7ba46b6b90fbe25155723f2126088a	d66f68ac9e7ba46b6b90fbe25155723f2126088a
linux	linux	>= d7c51b47ac11e66f547b55640405c1c474642d72 < ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3	ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3
linux	linux	>= d7c51b47ac11e66f547b55640405c1c474642d72 < 533aae7c94dbc2b14301cfd68ae7e0e90f0c8438	533aae7c94dbc2b14301cfd68ae7e0e90f0c8438
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 4.8 < 5.10.163	5.10.163
linux	linux_kernel	>= 5.11 < 5.15.86	5.15.86
linux	linux_kernel	>= 5.16 < 6.0.16	6.0.16
linux	linux_kernel	>= 6.1 < 6.1.2	6.1.2

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-476