What’s Vulnerable › Vulnerabilities

CVE-2020-14311

• Severity: medium (CVSS 6.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-31 · updated 2026-06-17
• Weakness: CWE-122

Description

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: 14.04, 16.04, 18.04, 20.04
• grub2: before 2.06 — fixed in 2.06
• openSUSE Leap: 15.1, 15.2
• Red Hat Enterprise Linux: 7.0, 8.0
• RedHat Enterprise Linux Eus: 8.1, 8.2
• RedHat Enterprise Linux Server Aus: 8.2
• RedHat Enterprise Linux Server Tus: 8.2

How to fix

Upgrade to a fixed version: grub2 2.06. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
• http://www.openwall.com/lists/oss-security/2021/09/17/2
• http://www.openwall.com/lists/oss-security/2021/09/17/4
• http://www.openwall.com/lists/oss-security/2021/09/21/1
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311
• https://security.gentoo.org/glsa/202104-05
• https://usn.ubuntu.com/4432-1/
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
• http://www.openwall.com/lists/oss-security/2021/09/17/2
• http://www.openwall.com/lists/oss-security/2021/09/17/4

Get alerted when CVE-2020-14311 or the next vulnerability affects your stack