The QEMU Guest Agent in QEMU is vulnerable to an integer overflow in the 
qmp_guest_file_read(). An attacker could exploit this by sending a crafted QMP 
command (including guest-file-read with a large count value) to the agent via 
the listening socket to trigger a g_malloc() call with a large memory chunk 
resulting in a segmentation fault.

A user could use this flaw to crash the QEMU guest agent process resulting in DoS.

Upstream Patch:
---------------
  -> https://git.qemu.org/?p=qemu.git;a=commit;h=141b197408ab398c4f474ac1a728ab316e921f2b

References:
-----------
  -> https://www.openwall.com/lists/oss-security/2018/10/17/4
  -> https://gist.github.com/fakhrizulkifli/c7740d28efa07dafee66d4da5d857ef6