qemu security update

15:4.2.1-10.el7 - e1000: fail early for evil descriptor Jason Wang Orabug: 32560552 CVE-2021-20257 - Document CVE-2020-27661 as fixed Mark Kanda Orabug: 32960200 CVE-2020-27661 - block: Avoid stale pointer dereference in blkgetaiocontext Greg Kurz - block: Fix blk-inflight during...