CVE-2022-49755
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…
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 2.6.35 before 4.14.305 from 4.15 before 4.19.272 from 4.20 before 5.4.231 from 5.5 before 5.10.166 from 5.11 before 5.15.91 from 5.16 before 6.1.9 |
Weakness classification
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850
- https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217
- https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78
- https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064
- https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a
- https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4
- https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2