Debian 9 Stretch DLA-2560-1 Critical: QEMU Code Exploits and DoS Risks

A MemoryRegionOps object may lack read/write callback methods,
leading to a NULL pointer dereference.

CVE-2020-15859

QEMU has a use-after-free in hw/net/e1000e_core.c because a guest
OS user can trigger an e1000e packet with the data's address set
to the e1000e's MMIO address.

CVE-2020-25084

QEMU has a use-after-free in hw/usb/hcd-xhci.c because the
usb_packet_map return value is not checked.

CVE-2020-28916

hw/net/e1000e_core.c has an infinite loop via an RX descriptor
with a NULL buffer address.

CVE-2020-29130

slirp.c has a buffer over-read because it tries to read a certain
amount of header data even if that exceeds the total packet
length.

CVE-2020-29443

ide_atapi_cmd_reply_end in hw/ide/atapi.c allows out-of-bounds
read access because a buffer index is not validated.

CVE-2021-20181

9pfs: ZDI-CAN-10904: QEMU Plan 9 file system TOCTOU privilege
escalation vulnerability.

CVE-2021-20221