Qemu before 1.6.2 block diver for the various disk image formats used by Bochs and for the QCOW version 2 format, are vulnerable to a possible crash caused by signed data types or a logic error while creating QCOW2 snapshots, which leads to incorrectly calling update_refcount() routine.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| http://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=246f65838d19db6db55bfb41117c35645a2c4789 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1078848 | issue tracking third party advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1086717 | issue tracking third party advisory |
| http://rhn.redhat.com/errata/RHSA-2014-0420.html | third party advisory |
| http://rhn.redhat.com/errata/RHSA-2014-0421.html | third party advisory |
| http://www.openwall.com/lists/oss-security/2014/03/26/8 | mailing list third party advisory patch |