CVE-2020-10756: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator. This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible information disclosure. This flaw affects versions of libslirp before 4.3.1.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 20.04 only
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Libslirp Project Libslirp: before 4.3.1 (fixed in 4.3.1)
• Opensuse Leap: version 15.0 only; version 15.1 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
• Red Hat Openstack: version 13 only

Published 2020-07-09. Last modified 2026-06-17.