Vulnerability · Published Dec 29, 2024 · Assigned by mitre
CVE-2024-56738
Medium 5.3
In plain English
A medium-severity security flaw in GRUB2 from GNU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 65.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | grub2 | no fix listed | DEBIAN-CVE-2024-56738 |
| Debian:13 | grub2 | no fix listed | DEBIAN-CVE-2024-56738 |
| Debian:14 | grub2 | no fix listed | DEBIAN-CVE-2024-56738 |
| Ubuntu:22.04:LTS | grub2-signed | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:24.04:LTS | grub2-signed | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:25.10 | grub2-signed | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:26.04:LTS | grub2-signed | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:26.10 | grub2-signed | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:22.04:LTS | grub2-unsigned | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:24.04:LTS | grub2-unsigned | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:25.10 | grub2-unsigned | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:26.04:LTS | grub2-unsigned | no fix listed | UBUNTU-CVE-2024-56738 |
| Ubuntu:26.10 | grub2-unsigned | no fix listed | UBUNTU-CVE-2024-56738 |
Affected products (as reported)
Weakness: CWE-208 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N