CVE-2020-14311: Canonical Ubuntu Linux

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

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent 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.