5.5

CVE-2022-50453

gpiolib: cdev: fix NULL-pointer dereferences

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.8 < 5.10.163
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.86
Linux ≫ Linux Kernel Version >= 5.16 < 6.0.16
Linux ≫ Linux Kernel Version >= 6.1 < 6.1.2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.045
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/533aae7c94dbc2b14301cfd68ae7e0e90f0c8438
Patch
https://git.kernel.org/stable/c/6d79546622baab843172b52c3af035f83c1b21df
Patch
https://git.kernel.org/stable/c/7c755a2d6df511eeb5afba966ac28140f9ea5063
Patch
https://git.kernel.org/stable/c/ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3
Patch
https://git.kernel.org/stable/c/d66f68ac9e7ba46b6b90fbe25155723f2126088a
Patch