CVE-2026-80527: In the Linux kernel, the following vulnerability has been resolved: ceph: fix hanging __ceph_get_caps() with stale mds_

The fix implements two changes: (1) stop waiting forever in __ceph_get_caps() by adding a bounded wait time, then fall back to a retry path; (2) modify ceph_renew_caps() to issue a synchronous OPEN request whenever the inode does not actually hold the wanted capabilities, instead of only calling ceph_check_caps(). The code now checks if (issued & wanted) == wanted before using the asynchronous path, ensuring that stalled waiters eventually retry through a path that does not rely on stale mds_wanted state.