CVE-2025-0986
📋 TL;DR
This vulnerability in IBM PowerVM Hypervisor firmware allows a local user with specific Linux processor compatibility mode configurations to cause undetected data corruption during gzip compression using hardware acceleration. Affected systems are IBM PowerVM Hypervisor running firmware versions FW1050.00-FW1050.30 and FW1060.00-FW1060.20.
💻 Affected Systems
- IBM PowerVM Hypervisor
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Silent data corruption during gzip compression operations leading to data loss, file corruption, or system instability without detection.
Likely Case
Data integrity issues in compressed files or archives when using hardware acceleration, potentially affecting backup operations or data transfers.
If Mitigated
Minimal impact if hardware acceleration is disabled or affected configurations are avoided.
🎯 Exploit Status
Requires local access and specific configuration conditions to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FW1050.31 and FW1060.21 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/7229349
Restart Required: Yes
Instructions:
1. Download firmware update from IBM Fix Central. 2. Apply firmware update to PowerVM Hypervisor. 3. Reboot the system to activate the new firmware.
🔧 Temporary Workarounds
Disable hardware acceleration for gzip
linuxConfigure Linux to use software-based gzip compression instead of hardware acceleration.
echo 'options gzip_compress use_hw_accel=0' > /etc/modprobe.d/gzip.conf
reboot
Avoid affected processor compatibility modes
linuxConfigure Linux to use processor compatibility modes not affected by this vulnerability.
Check current processor mode with 'ppc64_cpu --compat'
Consult IBM documentation for safe configurations
🧯 If You Can't Patch
- Disable hardware acceleration for gzip compression operations.
- Implement data integrity checks on compressed files and archives.
🔍 How to Verify
Check if Vulnerable:
Check firmware version with 'lparstat -i' or 'lssyscfg -r sys -F state,type_model,serial_num,refcode' and compare to affected versions.Check Version:
lparstat -i | grep FirmwareVerify Fix Applied:
Verify firmware version is FW1050.31/FW1060.21 or later using same commands.📡 Detection & Monitoring
Log Indicators:
- Unexpected gzip compression errors
- Data integrity check failures on compressed files
- Hardware acceleration errors in system logs
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="system_logs" AND ("gzip" OR "compression") AND ("error" OR "corruption" OR "integrity")