CVE-2020-14310: Canonical Ubuntu Linux

Medium severity, CVSS 6.0. EPSS: 0.5% chance of exploitation in the next 30 days.

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 20.04 only
• GNU GRUB2: before 2.06 (fixed in 2.06)
• Opensuse Leap: version 15.1 only; version 15.2 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
• Red Hat Enterprise Linux Eus: version 8.1 only; version 8.2 only
• Red Hat Enterprise Linux Server Aus: version 8.2 only
• Red Hat Enterprise Linux Server Tus: version 8.2 only

Published 2020-07-31. Last modified 2026-06-17.