CVE-2021-46705 grub2-once uses fixed file name in /var/tmp
Local attackers can truncate arbitrary files via insecure temporary file handling in grub2-once, requiring a patch to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-46705?
CVE-2021-46705 is a medium-severity vulnerability in SUSE Linux Enterprise Server 15 SP4, published on 16 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Insecure Temporary File vulnerability in grub-once of grub2 in SUSE Linux Enterprise Server 15 SP4, openSUSE Factory allows local attackers to truncate arbitrary files. This issue affects: SUSE Linux Enterprise Server 15 SP4 grub2 versions prior to 2.06-150400.7.1. SUSE openSUSE Factory grub2 versions prior to 2.06-18.1.
Weakness: CWE-377
Which versions are affected by CVE-2021-46705?
It affects 1 product.
Linux distribution packages (1)
grub2 openSUSE:Tumbleweed | All versions | 2.06-18.1 |
Products include Gnu Grub2.
How do I fix CVE-2021-46705?
Apply the vendor's patch.
Is CVE-2021-46705 being exploited?
There is no known exploitation of CVE-2021-46705 in the wild and no public exploit code.
Other vulnerabilities in SUSE Linux Enterprise Server 15 SP4
- 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 GHSA-p6fp-whjx-7g5m, openSUSE-SU-2024:11926-1.