CVE-2020-14311

MEDIUM 6.0CVE-2020-14311 · Published 31/07/2020 · updated 17/06/2026

In short

CVE-2020-14311 is a MEDIUM (CVSS 6.0) vulnerability affecting grub2 (gnu).
Chance of exploitation in the next 30 days (EPSS): 0.46%, higher than 40.3% of all vulnerabilities.
Fix: update to 2.06 or later.

Package	Affected versions	Patched versions
grub2 gnu	`< 2.06`	`2.06`

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.

References

lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html · Mailing List
lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html · Mailing List
openwall.com/lists/oss-security/2021/09/17/2 · Mailing List
openwall.com/lists/oss-security/2021/09/17/4 · Mailing List
openwall.com/lists/oss-security/2021/09/21/1 · Mailing List
bugzilla.redhat.com/show_bug.cgi · Issue Tracking
security.gentoo.org/glsa/202104-05 · Third Party Advisory
usn.ubuntu.com/4432-1 · Third Party Advisory

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Package

Affected versions

Patched versions

grub2

gnu

< 2.06

2.06

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