CVE-2016-4439: Canonical Ubuntu Linux

Medium severity, CVSS 6.7. EPSS: 0.5% chance of exploitation in the next 30 days.

The esp_reg_write function in hw/scsi/esp.c in the 53C9X Fast SCSI Controller (FSC) support in QEMU does not properly check command buffer length, which allows local guest OS administrators to cause a denial of service (out-of-bounds write and QEMU process crash) or potentially execute arbitrary code on the QEMU host via unspecified vectors.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only
• Debian Debian Linux: version 8.0 only
• Qemu Qemu: up to and including 2.6.0

Published 2016-05-20. Last modified 2026-06-17.