Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks When parsing endpoint descriptors, ffs_data_got_descs() generates the eps_addrmap which contains the endpoint direction. However, epfile->in was previously only populated in ffs_func_eps_enable() which executes upon USB host connection. As a result, early userspace ioctls like FUNCTIONFS_DMABUF_ATTACH that run before the host connects would see epfile->in as 0, leading to incorrect DMA directions. By moving the initialization to ffs_epfiles_create(), epfile->in is accurate before userspace opens the endpoint files.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7b07a2a7ca02a20124b552be96c5a56910795488 before 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b; affected 7b07a2a7ca02a20124b552be96c5a56910795488 before 9e04055ab5fc0470a0031ee6934739f9aa8f34a5; affected 7b07a2a7ca02a20124b552be96c5a56910795488 before f99f32ea9aa976afcbec20647ed33b50a52002c1; affected 7b07a2a7ca02a20124b552be96c5a56910795488 before 82cfd4739011bdc7e87b5d585703427e89ddfaa5 |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.