An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.
https://usn.ubuntu.com/4369-1/
https://usn.ubuntu.com/4368-1/
https://usn.ubuntu.com/4367-1/
https://usn.ubuntu.com/4363-1/
https://security.netapp.com/advisory/ntap-20200608-0001/
https://patchwork.kernel.org/patch/11447049/
https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html