CVE-2019-20175

DISPUTED An issue was discovered in ide_dma_cb() in hw/ide/core.c in
QEMU 2.4.0 through 4.2.0. The guest system can crash the QEMU process in
the host system via a special SCSI_IOCTL_SEND_COMMAND. It hits an assertion
that implies that the size of successful DMA transfers there must be a
multiple of 512 (the size of a sector). NOTE: a member of the QEMU security
team disputes the significance of this issue because a “privileged guest
user has many ways to cause similar DoS effect, without triggering this
assert.”

Notes