block: skip sync_blockdev() on surprise removal in bdev_mark_dead()

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SUSE CVE-2026-64326

In the Linux kernel, the following vulnerability has been resolved: block: skip syncblockdev on surprise removal in bdevmarkdead bdevmarkdead's @surprise == true means the device is already gone. The filesystem callback fsbdevmarkdead honours this and skips syncfilesystem, but the bare block devi...

CVE-2026-64326

CVE-2026-64326 affects the Linux kernel: when a block device is removed with surprise removal (surprise == true), the bdev_mark_dead path previously could call sync_blockdev() unconditionally, causing writeback to block and potentially hang the reset worker and dependent tasks. The fixed behavior...