CVE-2020-14309

Severity: medium (CVSS 6.7 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: 2020-07-30 · updated 2026-06-17
Weakness: CWE-190

Description

There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.

Affected products

grub2: before 2.06 — fixed in 2.06
openSUSE Leap: 15.1, 15.2

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
https://bugzilla.redhat.com/show_bug.cgi?id=1852022
https://security.gentoo.org/glsa/202104-05
https://security.netapp.com/advisory/ntap-20200731-0008/
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
https://bugzilla.redhat.com/show_bug.cgi?id=1852022
https://security.gentoo.org/glsa/202104-05
https://security.netapp.com/advisory/ntap-20200731-0008/
https://usn.ubuntu.com/4432-1/

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