CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf

In the Linux kernel, the following vulnerability has been resolved: xfs: don't hold buffer locks across sync transaction commit in xfssyncsbbuf xfssyncsbbuf holds sb/rtsb buffer locks across a synchronous xfstranscommit, which flushes the CIL push workqueue internally. If shutdown occurs during t...