Buffer overflow in the ccid_card_vscard_handle_message function in hw/ccid-card-passthru.c in QEMU before 0.15.2 and 1.x before 1.0-rc4 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted VSC_ATR message.
https://bugzilla.redhat.com/show_bug.cgi?id=751310
http://rhn.redhat.com/errata/RHSA-2011-1801.html
http://rhn.redhat.com/errata/RHSA-2011-1777.html
http://git.qemu.org/?p=qemu.git%3Ba=log%3Bh=refs/heads/stable-1.0