binfmtmisc: fix shift-out-of-bounds in checkspecial_flags
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.86 by commit 88cea1676a09f7c45a1438153a126610c33b1590. For more details please see the references link.