CVE-2025-21436 Use After Free in DSP Service
Concurrent IOCTL calls in the DSP service can trigger a use-after-free, potentially allowing attackers to execute code or escalate privileges on Android devices.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-21436?
CVE-2025-21436 is a high-severity use after free vulnerability in Qualcomm Fastconnect 7800 Firmware, published on 7 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Memory corruption may occur while initiating two IOCTL calls simultaneously to create processes from two different threads.
Weakness: CWE-416
Which versions are affected by CVE-2025-21436?
It affects 25 products.
Products include Qualcomm Fastconnect 7800 Firmware, Qualcomm Qmp1000 Firmware, Qualcomm Sm8735 Firmware, Qualcomm Sm8750 Firmware, Qualcomm Sm8750p Firmware, Qualcomm Snapdragon 8 Gen 3 Mobile Platform Firmware and 19 more.
How do I fix CVE-2025-21436?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-21436 being exploited?
There is no known exploitation of CVE-2025-21436 in the wild and no public exploit code.
Other vulnerabilities in Qualcomm Fastconnect 7800 Firmware
Sources
Also known as 3927062, A-388048322, ASB-A-388048322, GHSA-v97v-vwrw-5r2q.