In the Linux kernel, the following vulnerability has been resolved:

io_uring/rsrc: require cloned buffers to share accounting contexts

When IORING_REGISTER_CLONE_BUFFERS is used to clone buffers from uring
instance A to uring instance B, where A and B use different MMs for
accounting, the accounting can go wrong:
If uring instance A is closed before uring instance B, the pinned memory
counters for uring instance B will be decremented, even though the pinned
memory was originally accounted through uring instance A; so the MM of
uring instance B can end up with negative locked memory.

https://git.kernel.org/stable/c/19d340a2988d4f3e673cded9dde405d727d7e248

https://git.kernel.org/stable/c/cafc60ae35f82ebf156b3245f979ca61cbb8e42c

https://git.kernel.org/stable/c/efd96fbe23fa87de39116f632401f67b93be21ab