CVE-2019-19813 (active_iq_unified_manager, aff_a400_firmware, aff_a700s_firmware, data_availability_services, debian_linux, fas8300_firmware, fas8700_firmware, h610s_firmware, hci_management_node, linux_kernel, solidfire, steelstore_cloud_integrated_storage, ubuntu_linux)

In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in __mutex_lock in kernel/locking/mutex.c. This is related to mutex_can_spin_on_owner in kernel/locking/mutex.c, __btrfs_qgroup_free_meta in fs/btrfs/qgroup.c, and btrfs_insert_delayed_items in fs/btrfs/delayed-inode.c.

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