CVE-2024-45781
📋 TL;DR
This vulnerability in grub2 allows attackers to write beyond heap boundaries when processing symbolic links on UFS filesystems. This could lead to data corruption or potentially bypass secure boot protections. Systems using grub2 with UFS filesystem support are affected.
💻 Affected Systems
- grub2
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Secure boot bypass allowing persistent compromise of boot process and potential system takeover.
Likely Case
System instability, data corruption, or denial of service from heap corruption.
If Mitigated
Limited impact if secure boot is properly configured and UFS filesystems are not used.
🎯 Exploit Status
Requires ability to create/modify symbolic links on UFS filesystem accessible during boot process.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor-specific updates (e.g., Red Hat RHSA-2025:16154, RHSA-2025:6990)
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2024-45781
Restart Required: Yes
Instructions:
1. Update grub2 package via system package manager. 2. Regenerate grub configuration. 3. Reboot system to load patched grub.
🔧 Temporary Workarounds
Disable UFS filesystem support
linuxRecompile grub2 without UFS filesystem support if not needed
Recompile grub2 with --disable-ufs option
Secure boot enforcement
linuxEnsure secure boot is properly configured and validated
🧯 If You Can't Patch
- Restrict physical and local access to boot devices
- Monitor for unauthorized boot configuration changes
🔍 How to Verify
Check if Vulnerable:
Check grub2 version and verify if UFS module is present: lsmod | grep ufsCheck Version:
grub2-install --versionVerify Fix Applied:
Verify grub2 package version matches patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected grub errors during boot
- Secure boot validation failures
Network Indicators:
- Not network exploitable
SIEM Query:
Search for grub boot failures or secure boot events in system logs