SB2025062781 - Security restrictions bypass in GNU GRUB
Published: June 27, 2025
Security Bulletin ID
SB2025062781
Severity
Low
Patch available
NO
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Observable discrepancy (CVE-ID: CVE-2024-56738)
The vulnerability allows an attacker to bypass implemented security restrictions.
The vulnerability exists due to software does not use a constant-time algorithm for grub_crypto_memcmp. An attacker with physical access to the system can perform side-channel attacks to bypass implemented security restrictions and escalate privileges on the system.
Remediation
Cybersecurity Help is not aware of any official remediation provided by the vendor.