CVE-2022-50767: fbdev: smscufx: Fix several use-after-free bugs

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-24 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: smscufx: Fix several use-after-free bugs Several types of UAFs can occur when physically removing a USB device. Adds ufx_ops_destroy() function to .fb_destroy of fb_ops, and in this function, there is kref_put() that finally calls ufx_free(). This fix prevents multiple UAFs.

Affected products

Linux kernel: 3.2 — fixed in 6.1

How to fix

Upgrade to a fixed version: Linux kernel 6.1. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/3f40852d671072836fb7ae331a1f28a24223c4e8
https://git.kernel.org/stable/c/5385af2f89bc352fb70753ab41b2bb036190141f
https://git.kernel.org/stable/c/6f2075ea883e5d7730d0c9ebb1bb8e7a1a7e953f
https://git.kernel.org/stable/c/70faf9d9b6cc74418716bbf76fe75bd2da10ad4a
https://git.kernel.org/stable/c/8d924b262f3178a9b17c17d4306a9f426c508bd9
https://git.kernel.org/stable/c/cc67482c9e5f2c80d62f623bcc347c29f9f648e1
https://git.kernel.org/stable/c/cc6a7249842fceda7574ceb63275a2d5e99d2862
https://git.kernel.org/stable/c/d9ddfeb01fb95ffbbc7031d46a5ee2a5e45cbb86

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