Heap-based buffer overflow in the Cirrus VGA implementation in (1) KVM
before kvm-82 and (2) QEMU on Debian GNU/Linux and Ubuntu might allow
local users to gain privileges by using the VNC console for a
connection, aka the LGD-54XX "bitblt" heap overflow. NOTE: this issue
exists because of an incorrect fix for CVE-2007-1320.
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