CVE-2020-14311

grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow

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Severity

Moderate

Red Hat Product Security

5.7

CVSS 3.1

Review impact separately from score.

Published · July 30, 2020

Updated · February 24, 2026

Description

A flaw was found in grub2 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 a subsequent heap-based buffer overflow. The highest threat from this vulnerability is to integrity and system availability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.7
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H

CWE-190 · Integer Overflow or Wraparound