CVE-2026-25701
📋 TL;DR
An insecure temporary file vulnerability in openSUSE sdbootutil allows local users to pre-create directories to manipulate sensitive data. This can lead to information disclosure, data integrity violations, or system file overwrites. The vulnerability affects local users on systems running vulnerable versions of sdbootutil.
💻 Affected Systems
- openSUSE sdbootutil
⚠️ 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
Local attackers could overwrite protected system files, potentially compromising system integrity or gaining elevated privileges.
Likely Case
Local users could access private information from /var/lib/pcrlock.d or manipulate backup data integrity.
If Mitigated
With proper file permissions and access controls, impact is limited to authorized local users only.
🎯 Exploit Status
Exploitation requires local access and knowledge of the vulnerable temporary file handling.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version containing commit 5880246d3a02642dc68f5c8cb474bf63cdb56bca
Vendor Advisory: https://bugzilla.suse.com/show_bug.cgi?id=1258241
Restart Required: No
Instructions:
1. Update sdbootutil package via system package manager. 2. Verify the fix is applied by checking package version or commit hash.
🔧 Temporary Workarounds
Restrict temporary directory permissions
linuxSet strict permissions on /tmp/pcrlock.d.bak directory to prevent unauthorized access
chmod 700 /tmp/pcrlock.d.bak
chown root:root /tmp/pcrlock.d.bak
🧯 If You Can't Patch
- Implement strict file permissions on /tmp/pcrlock.d.bak and /var/lib/pcrlock.d directories
- Monitor for suspicious file creation or symlink activity in temporary directories
🔍 How to Verify
Check if Vulnerable:
Check sdbootutil version or commit hash. If before commit 5880246d3a02642dc68f5c8cb474bf63cdb56bca, system is vulnerable.Check Version:
rpm -q sdbootutilVerify Fix Applied:
Verify sdbootutil package version includes commit 5880246d3a02642dc68f5c8cb474bf63cdb56bca📡 Detection & Monitoring
Log Indicators:
- Unusual file creation in /tmp/pcrlock.d.bak
- Symlink creation in temporary directories by non-root users
Network Indicators:
- None - this is a local file system vulnerability
SIEM Query:
File creation events in /tmp/pcrlock.d.bak by non-root users OR symlink creation in /tmp directories