CVE-2020-15863: Canonical Ubuntu Linux

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 20.04 only
• Debian Debian Linux: version 10.0 only
• Qemu Qemu: up to and including 5.0.0; version 5.1.0 only

Published 2020-07-28. Last modified 2026-06-17.