CVE-2025-21453: Qualcomm 315 5G IoT Use-After-Free Flaw

CVE-2025-21453 Overview

CVE-2025-21453 is a memory corruption vulnerability affecting a broad range of Qualcomm Snapdragon chipsets and firmware components. The flaw occurs while processing a data structure when an iterator is accessed after it has been removed, resulting in a use-after-free condition [CWE-416]. Qualcomm disclosed the issue in the May 2025 Security Bulletin, and it impacts hundreds of mobile, automotive, IoT, compute, wearable, and modem-RF products, including Snapdragon 8 Gen 1/2/3, Snapdragon 888, Snapdragon Auto 5G Modem-RF, and multiple FastConnect, WCN, and QCA components. Successful exploitation requires local, low-privileged access but can lead to a full compromise of confidentiality, integrity, and availability.

Critical Impact
A low-privileged local process can trigger a use-after-free in Qualcomm firmware, corrupting kernel memory and potentially achieving arbitrary code execution or persistent device compromise.

Affected Products

Qualcomm Snapdragon mobile platforms including Snapdragon 8 Gen 1/2/3, 8+ Gen 1/2, 888/888+, 870, 865/865+, and legacy 6xx/7xx/8xx series
Qualcomm automotive and IoT platforms including SA8155P, SA8255P, SA8295P, SA8540P, SA8770P, SA8775P, QCS9100, Robotics RB2/RB3, and Vision Intelligence 100–400
Qualcomm connectivity firmware including FastConnect 6200/6700/6800/6900/7800, WCN3xxx/6xxx/7xxx, WSA88xx, WCD93xx, QCA6xxx/8xxx/9xxx, and Snapdragon X12/X32/X35/X50/X55/X62/X65/X72/X75 modems

Discovery Timeline

2025-05-06 - CVE-2025-21453 published to NVD following disclosure in the Qualcomm May 2025 Security Bulletin
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-21453

Vulnerability Analysis

The vulnerability is a use-after-free condition [CWE-416] that arises when a data structure's iterator is dereferenced after the underlying element has already been removed. When code holds a stale reference to a freed iterator, subsequent access reads or writes memory that has been released back to the allocator, or reused by another allocation. This corrupts the heap state and can be leveraged to hijack control flow, overwrite adjacent kernel objects, or leak sensitive memory contents. Because the flaw resides in Qualcomm firmware components used across mobile, automotive, and IoT SoCs, the blast radius spans hundreds of shipping devices.

Root Cause

The root cause is improper lifetime management of an iterator over a mutable data structure. Removal logic frees the iterator's backing element without invalidating outstanding references, leaving dangling pointers accessible on later code paths. When those paths execute, the freed memory has often been reclaimed for unrelated allocations, producing type confusion and heap corruption.

Attack Vector

Exploitation requires local access with low privileges and no user interaction. A malicious application or process running on the device can invoke the vulnerable firmware interface with a crafted sequence of operations that first triggers iterator removal, then forces access to the stale iterator. The vulnerability is scoped to the local device (AV:L) and can compromise confidentiality, integrity, and availability of firmware and any resources it protects, including kernel-mode assets on Android and RTOS-based subsystems.

No public proof-of-concept exploit code is available for CVE-2025-21453. See the Qualcomm May 2025 Security Bulletin for the vendor's technical description.

Detection Methods for CVE-2025-21453

Indicators of Compromise

Unexplained kernel panics, subsystem restarts, or SubSystem Restart (SSR) events on Qualcomm modem, WLAN, or DSP components
Repeated crashes in firmware processes referencing iterator or list traversal call stacks after userland IPC calls
Installation of unsigned or side-loaded applications immediately preceding firmware crash telemetry

Detection Strategies

Monitor Android logcat, dmesg, and vendor ramdump outputs for use-after-free signatures and repeated crashes tied to Qualcomm drivers
Deploy mobile threat defense telemetry to flag applications that invoke privileged Qualcomm IOCTLs or HAL interfaces at abnormal rates
Baseline device firmware build fingerprints and alert on devices missing the Qualcomm May 2025 patch level

Monitoring Recommendations

Enable device attestation and MDM policy checks that require the May 2025 or later Android Security Patch Level on Qualcomm-based endpoints
Correlate app installation events with subsequent firmware crash telemetry to identify local exploitation attempts
Track vendor bulletins and OEM patch propagation to catch devices lagging on firmware updates

How to Mitigate CVE-2025-21453

Immediate Actions Required

Apply the Qualcomm May 2025 firmware patches through the affected OEM's security update channel as soon as they are distributed
Inventory Snapdragon-based mobile, automotive, IoT, and compute assets and map them to the affected product list in the Qualcomm bulletin
Restrict installation of untrusted applications on managed devices and enforce app allowlists via MDM policy

Patch Information

Qualcomm addressed the issue in the May 2025 Security Bulletin. Fixes are delivered to OEMs, who must integrate them into their Android Security Patch Level or firmware image releases. Refer to the Qualcomm May 2025 Security Bulletin for the authoritative list of affected components and remediation guidance, and consult the device manufacturer's update advisory for shipping dates.

Workarounds

Limit local access on affected devices by disabling developer mode, ADB, and side-loading where operationally feasible
Isolate high-risk devices from sensitive networks until OEM firmware updates are applied
For automotive and IoT deployments, restrict physical and local network access to management interfaces that could load untrusted code

bash

# Verify Android Security Patch Level on a managed device
adb shell getprop ro.build.version.security_patch

# Expected output should be 2025-05-01 or later on Qualcomm-based devices