An integer overflow was found in QEMU 4.0.1 through 4.2.0 in the way it implemented ATI VGA emulation. This flaw occurs in the ati_2d_blt() routine in hw/display/ati-2d.c while handling MMIO write operations through the ati_mm_write() callback. A malicious guest could abuse this flaw to crash the QEMU process, resulting in a denial of service.
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://www.openwall.com/lists/oss-security/2020/04/24/2 | patch mailing list third party advisory |
| https://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=ac2071c3791b67fc7af78b8ceb320c01ca1b5df7 | |
| https://usn.ubuntu.com/4372-1/ | vendor advisory |