CVE-2022-49755

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

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

usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait

While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind.

Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.

Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < facf353c9e8d7885b686d9a4b173d4e0af6441d2; >= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4; >= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < a8d40942df074f4ebcb9bd3413596d92f323b064; >= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < 6dd9ea05534f323668db94fcc2726c7a84547e78; >= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < ae8e136bcaae96163b5821984de1036efc9abb1a; >= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < 6aee197b7fbcd61596a78b47d553f2f99111f217; >= ddf8abd2599491cbad959c700b90ba72a5dce8d0, < 6a19da111057f69214b97c62fb0ac59023970850
LinuxLinux2.6.35

References

Timeline

Published
Mar 27, 2025
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2022-49755: High severity, CVSS 7.8 | Vulnix