In the Linux kernel, the following vulnerability has been resolved: iouring: fix memory leak when removing provided buffers When removing provided buffers, iobuffer structs are not being disposed of, leading to a memory leak. They can't be freed individually, because they are allocated in page-sized groups. They need to be added to some free list instead, such as iobufferscache. All callers already hold the lock protecting it, apart from when destroying buffers, so had to extend the lock there.