CVE-2024-56738
GNU GRUB Timing Attack Vulnerability
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.
INFO
Published Date :
Dec. 29, 2024, 7:15 a.m.
Last Modified :
June 24, 2025, 12:29 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the affected GRUB packages.
- Reboot the system after the update.
Public PoC/Exploit Available at Github
CVE-2024-56738 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-56738.
| URL | Resource |
|---|---|
| https://savannah.gnu.org/bugs/?66603 | Issue Tracking Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-56738 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-56738
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-56738 vulnerability anywhere in the article.
-
BleepingComputer
Microsoft uses AI to find flaws in GRUB2, U-Boot, Barebox bootloaders
Microsoft used its AI-powered Security Copilot to discover 20 previously unknown vulnerabilities in the GRUB2, U-Boot, and Barebox open-source bootloaders. GRUB2 (GRand Unified Bootloader) is the defa ... Read more
The following table lists the changes that have been made to the
CVE-2024-56738 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 24, 2025
Action Type Old Value New Value Added CWE CWE-203 Added CPE Configuration OR *cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* versions up to (including) 2.12 Added Reference Type MITRE: https://savannah.gnu.org/bugs/?66603 Types: Issue Tracking, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Dec. 31, 2024
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N -
New CVE Received by [email protected]
Dec. 29, 2024
Action Type Old Value New Value Added 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. Added CWE CWE-208 Added Reference https://savannah.gnu.org/bugs/?66603