An integer overflow resulting in memory corruption issue was found in various Bluetooth functions. It could occur in routines wherein 'len' parameter is a 'signed int' which subsequently converts to an unsigned integer resulting in memcpy() copying large amounts of memory.

A user inside guest could use this flaw to crash the Qemu process resulting in DoS.

Upstream patch:
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  -> https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg03570.html

Reference:
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  -> https://www.openwall.com/lists/oss-security/2018/11/29/1