Tracker / CVE-2022-49755
CVE-2022-49755
High 7.8
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 and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 2.6.35 → 4.14.305 |
| linux | linux_kernel · 4.15 → 4.19.272 |
| linux | linux_kernel · 4.20 → 5.4.231 |
| linux | linux_kernel · 5.11 → 5.15.91 |
| linux | linux_kernel · 5.16 → 6.1.9 |
| linux | linux_kernel · 5.5 → 5.10.166 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.