CVE-2022-49755: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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).

Affected products

• Linux Linux Kernel: from 2.6.35, before 4.14.305 (fixed in 4.14.305); from 4.15, before 4.19.272 (fixed in 4.19.272); from 4.20, before 5.4.231 (fixed in 5.4.231); from 5.5, before 5.10.166 (fixed in 5.10.166); from 5.11, before 5.15.91 (fixed in 5.15.91); from 5.16, before 6.1.9 (fixed in 6.1.9); …

Published 2025-03-27. Last modified 2026-06-17.