In the Linux kernel, the following vulnerability has been resolved:
VDUSE: avoid leaking information to userspace
The bounceing is not necessarily page aligned, so current VDUSE can leak kernel information through mapping bounce pages to userspace. Allocate bounce pages with __GFP_ZERO to avoid leaking information to userspace.
References
- https://git.kernel.org/stable/c/00335df9da2011e095f846d645cc2e9fd2907659
- https://git.kernel.org/stable/c/5e88c1bc3a41d9a260dd42bae8ad18fd4f35bbe1
- https://git.kernel.org/stable/c/690fb82c4122f8c2656fa4f842275132771b68b9
- https://git.kernel.org/stable/c/9c1523803445ee0348f62b77793266dd981596e0
- https://git.kernel.org/stable/c/fde25641cbddd0c084e3320d08f755e7e6acfae5