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

io_uring/af_unix: disable sending io_uring over sockets

File reference cycles have caused lots of problems for io_uring
in the past, and it still doesn't work exactly right and races with
unix_stream_read_generic(). The safest fix would be to completely
disallow sending io_uring files via sockets via SCM_RIGHT, so there
are no possible cycles invloving registered files and thus rendering
SCM accounting on the io_uring side unnecessary.

kernel.org https://git.kernel.org/stable/c/18824f592aad4124d79751bbc1500ea86ac3ff29 [No types assigned]

kernel.org https://git.kernel.org/stable/c/3fe1ea5f921bf5b71cbfdc4469fb96c05936610e [No types assigned]

kernel.org https://git.kernel.org/stable/c/5a33d385eb36991a91e3dddb189d8679e2aac2be [No types assigned]

kernel.org https://git.kernel.org/stable/c/705318a99a138c29a512a72c3e0043b3cd7f55f4 [No types assigned]

kernel.org https://git.kernel.org/stable/c/bcedd497b3b4a0be56f3adf7c7542720eced0792 [No types assigned]

kernel.org https://git.kernel.org/stable/c/f2f57f51b53be153a522300454ddb3887722fb2c [No types assigned]