CVE-2020-14309 Integer overflow in Grub
An integer overflow in GRUB2's squashfs handling allows heap-based buffer overflows, potentially enabling code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-14309?
CVE-2020-14309 is a medium-severity vulnerability in Opensuse Leap, published on 30 Jul 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2020-14309?
It affects 2 products.
Products include Gnu Grub2, Opensuse Leap.
How do I fix CVE-2020-14309?
Upgrade to a fixed version.
Is CVE-2020-14309 being exploited?
There is no known exploitation of CVE-2020-14309 in the wild and no public exploit code.
Other vulnerabilities in Opensuse Leap
- CVE-2024-56737 Memory corruption in GRUB2
- CVE-2022-28733 Integer underflow in grub_net_recv_ip4_packets
- CVE-2022-28734 Out-of-bounds write when handling split HTTP headers
- CVE-2025-61662 Grub2: missing unregister call for gettext command may lead to use-after-free
- CVE-2024-45782 Grub2: fs/hfs: strcpy() using the volume name (fs/hfs.c:382)
Sources
Also known as ALPINE-CVE-2020-14309, AZL-6457, DEBIAN-CVE-2020-14309, GHSA-8whj-mpcj-4jv6, UBUNTU-CVE-2020-14309.