CVE-2025-27087
📋 TL;DR
A kernel vulnerability in Cray Operating System (COS) allows local attackers to trigger a Denial of Service condition. This affects systems running vulnerable versions of COS, primarily HPE Cray supercomputing environments. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- HPE Cray Operating System (COS)
⚠️ 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
Complete system crash or kernel panic requiring physical reboot, disrupting all computational workloads on affected nodes.
Likely Case
Temporary service disruption on individual compute nodes, causing job failures and requiring node restart.
If Mitigated
Minimal impact with proper access controls preventing unauthorized local access to vulnerable systems.
🎯 Exploit Status
Local DoS vulnerabilities typically have low exploitation complexity once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to HPE Cray security bulletin for specific patched versions
Vendor Advisory: https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbcr04838en_us&docLocale=en_US
Restart Required: Yes
Instructions:
1. Review HPE Cray security bulletin 2. Apply recommended kernel updates 3. Reboot affected systems 4. Verify patch installation
🔧 Temporary Workarounds
Restrict local access
linuxLimit shell access to trusted administrators only
# Review and restrict user accounts with shell access
# Use sudo policies to limit privileged operations
Monitor system stability
linuxImplement monitoring for kernel panics and system crashes
# Configure monitoring for kernel oops messages
# Set up alerts for unexpected reboots
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access
- Isolate vulnerable systems in secure network segments with limited user access
🔍 How to Verify
Check if Vulnerable:
Check COS version against HPE Cray security bulletin; verify if running affected kernel versionCheck Version:
uname -r (for kernel version); consult COS documentation for full version infoVerify Fix Applied:
Verify kernel version after update matches patched version in advisory; test system stability📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- Unexpected system reboots
- Process crash dumps
- System log entries indicating resource exhaustion
Network Indicators:
- Sudden loss of connectivity to compute nodes
- Job scheduler reporting node failures
SIEM Query:
source="kernel" AND ("panic" OR "oops" OR "BUG") AND host="cray-node*"