CVE-2025-71236
📋 TL;DR
A NULL pointer dereference vulnerability in the Linux kernel's QLogic Fibre Channel driver (qla2xxx) can cause kernel panics and system crashes when handling certain storage operations. This affects systems using QLogic Fibre Channel adapters with the vulnerable driver. The vulnerability occurs when the driver attempts to free memory without validating a pointer first.
💻 Affected Systems
- Linux kernel with qla2xxx driver
⚠️ 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 leading to denial of service, potential data corruption, and disruption of storage operations.
Likely Case
System crash or kernel panic requiring reboot, causing temporary storage unavailability.
If Mitigated
No impact if patched or if vulnerable driver not loaded.
🎯 Exploit Status
Exploitation requires triggering specific storage operations or RSCN events. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel commits: 1a9585e4c58d1f1662b3ca46110ed4f583082ce5, 40ae93668226b610edb952c6036f607a61750b57, 944378ead9a48d5d50e9e3cc85e4cdb911c37ca1, 949010291bb941d53733ed08a33454254d9afb1b
Vendor Advisory: https://git.kernel.org/stable/c/1a9585e4c58d1f1662b3ca46110ed4f583082ce5
Restart Required: Yes
Instructions:
1. Update to a kernel version containing the fix commits. 2. Check with your Linux distribution for backported patches. 3. Reboot the system after kernel update.
🔧 Temporary Workarounds
Unload qla2xxx driver
linuxTemporarily disable the vulnerable driver if QLogic Fibre Channel adapters are not essential
modprobe -r qla2xxx
Blacklist driver
linuxPrevent driver from loading on boot
echo 'blacklist qla2xxx' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Isolate affected systems from storage network changes that trigger RSCN events
- Implement monitoring for kernel panic events and have rapid recovery procedures
🔍 How to Verify
Check if Vulnerable:
Check if qla2xxx driver is loaded: lsmod | grep qla2xxx. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commits. Check dmesg for absence of qla2xxx NULL pointer errors.📡 Detection & Monitoring
Log Indicators:
- Kernel NULL pointer dereference errors mentioning qla2xxx
- System crashes with qla_fab_async_scan in call trace
- RSCN database changed messages followed by crashes
Network Indicators:
- Increased RSCN events in Fibre Channel fabric
SIEM Query:
source="kernel" AND "NULL pointer dereference" AND "qla2xxx"🔗 References
- https://git.kernel.org/stable/c/044131fce27749cb6ea986baf861fbe63c6d8a17
- https://git.kernel.org/stable/c/1a9585e4c58d1f1662b3ca46110ed4f583082ce5
- https://git.kernel.org/stable/c/40ae93668226b610edb952c6036f607a61750b57
- https://git.kernel.org/stable/c/85c0890fea6baeba9c4ae6ae090182cbb1a93fb2
- https://git.kernel.org/stable/c/944378ead9a48d5d50e9e3cc85e4cdb911c37ca1
- https://git.kernel.org/stable/c/949010291bb941d53733ed08a33454254d9afb1b
- https://git.kernel.org/stable/c/a46f81c1e627437de436e517f5fd4b725c15a1e6
- https://git.kernel.org/stable/c/b6df15aec8c3441357d4da0eaf4339eb20f5999f
