Vulnerability 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).
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.35, < 4.14.305 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850Patch
- https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217Patch
- https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78Patch
- https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064Patch
- https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1aPatch
- https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4Patch
- https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2Patch
FAQ
What is CVE-2022-49755?
CVE-2022-49755 is a vulnerability with a CVSS score of 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 th...
How severe is CVE-2022-49755?
CVE-2022-49755 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-49755?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.