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CVE-2022-49755

7.8 · HIGH

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…

Published Mar 27, 2025CWE-416EPSS 0.23%

Overview

CVE-2022-49755 is a high-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850Refgit.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217Refgit.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78Refgit.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064Refgit.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1aRefgit.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4Refgit.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49755?

CVE-2022-49755 is a high-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49755?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49755?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49755?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49755 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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