The v9fs_xattrcreate function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local guest OS administrators to obtain sensitive host heap memory information by reading xattribute values before writing to them.
Gentoo Linux Security Advisory 201611-11 - Multiple vulnerabilities have been found in QEMU, the worst of which could cause a Denial of Service condition. Versions less than 2.7.0-r6 are affected.