CVE-2025-21438
📋 TL;DR
This vulnerability allows memory corruption when a user-space application makes a specific IOCTL call to read board data on Qualcomm chipsets. Attackers could potentially execute arbitrary code or cause system crashes. This affects devices using vulnerable Qualcomm hardware components.
💻 Affected Systems
- Qualcomm chipsets with vulnerable drivers
📦 What is this software?
Snapdragon 7c Compute Platform \(sc7180 Ac\) Firmware by Qualcomm
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Snapdragon 7c\+ Gen 3 Compute Firmware by Qualcomm
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Snapdragon 8c Compute Platform \(sc8180x Ad\) Firmware by Qualcomm
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Snapdragon 8c Compute Platform \(sc8180xp Ad\) Firmware by Qualcomm
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Snapdragon 8cx Compute Platform \(sc8180x Aa\) Firmware by Qualcomm
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Snapdragon 8cx Compute Platform \(sc8180x Ab\) Firmware by Qualcomm
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Snapdragon 8cx Compute Platform \(sc8180xp Ac\) Firmware by Qualcomm
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Snapdragon 8cx Compute Platform \(sc8180xp Af\) Firmware by Qualcomm
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Snapdragon 8cx Gen 2 5g Compute Platform \(sc8180x Ac\) Firmware by Qualcomm
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Snapdragon 8cx Gen 2 5g Compute Platform \(sc8180x Af\) Firmware by Qualcomm
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Snapdragon 8cx Gen 2 5g Compute Platform \(sc8180xp Aa\) Firmware by Qualcomm
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Snapdragon 8cx Gen 2 5g Compute Platform \(sc8180xp Ab\) Firmware by Qualcomm
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Snapdragon 8cx Gen 3 Compute Platform \(sc8280xp Ab\) Firmware by Qualcomm
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Snapdragon 8cx Gen 3 Compute Platform \(sc8280xp Bb\) Firmware by Qualcomm
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⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level access, allowing complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Local denial of service (system crash/reboot) or limited information disclosure from kernel memory.
If Mitigated
Limited impact if proper access controls restrict user-space applications from making the vulnerable IOCTL calls.
🎯 Exploit Status
Requires local access and ability to make specific IOCTL calls; exploitation depends on driver accessibility and memory layout.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches included in Qualcomm April 2025 security bulletin
Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2025-bulletin.html
Restart Required: Yes
Instructions:
1. Check Qualcomm advisory for specific chipset patches. 2. Obtain updated firmware/drivers from device manufacturer. 3. Apply patches according to manufacturer instructions. 4. Reboot system to load patched drivers.
🔧 Temporary Workarounds
Restrict IOCTL access
linuxUse SELinux/AppArmor policies to restrict user-space applications from accessing the vulnerable driver IOCTL interface.
# Example SELinux policy modification (consult specific policy for exact commands)
Driver blacklisting
linuxPrevent loading of the vulnerable driver if not required for system functionality.
echo 'blacklist vulnerable_driver_module' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Implement strict application sandboxing to limit which processes can make kernel IOCTL calls
- Monitor for unusual driver access patterns or crash reports related to the affected driver
🔍 How to Verify
Check if Vulnerable:
Check Qualcomm chipset version and driver versions against April 2025 security bulletin; examine loaded kernel modules for vulnerable drivers.Check Version:
cat /proc/cpuinfo | grep -i qualcomm && lsmod | grep -i qualcommVerify Fix Applied:
Verify driver version has been updated post-patch; check that April 2025 security patches are applied to Qualcomm components.📡 Detection & Monitoring
Log Indicators:
- Kernel panic or oops messages related to Qualcomm drivers
- Audit logs showing unusual IOCTL calls to driver interfaces
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
source="kernel" AND ("panic" OR "oops") AND "qualcomm" OR source="audit" AND "ioctl" AND driver_name