Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before facf353c9e8d7885b686d9a4b173d4e0af6441d2; affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4; affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before a8d40942df074f4ebcb9bd3413596d92f323b064; affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before 6dd9ea05534f323668db94fcc2726c7a84547e78; affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before ae8e136bcaae96163b5821984de1036efc9abb1a; affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before 6aee197b7fbcd61596a78b47d553f2f99111f217; affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 before 6a19da111057f69214b97c62fb0ac59023970850 |
| Linux / Linux | affected 2.6.35; unaffected 0 before 2.6.35; unaffected 4.14.305 through 4.14.*; unaffected 4.19.272 through 4.19.*; unaffected 5.4.231 through 5.4.*; unaffected 5.10.166 through 5.10.*; unaffected 5.15.91 through 5.15.*; unaffected 6.1.9 through 6.1.*; unaffected 6.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2
- https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4
- https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064
- https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78
- https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a
- https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217
- https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850
ADP enrichment
No English description supplied.
No references supplied.