Attack Chain

1. An attacker gains initial access to a device containing a vulnerable Qualcomm DSP.
2. The attacker triggers a process creation event on the DSP. This could involve sending a specifically crafted request to the DSP or exploiting another vulnerability to initiate the process creation.
3. During the process creation, a memory allocation failure occurs within the DSP kernel.
4. This allocation failure leads to memory corruption, where data is written to an incorrect memory location.
5. The attacker leverages the memory corruption to overwrite critical kernel data structures or code.
6. The attacker injects malicious code into the corrupted memory region.
7. The DSP executes the injected malicious code, granting the attacker control over the DSP.
8. The attacker can then use the compromised DSP to further compromise the device or network it is connected to.

Impact

Successful exploitation of CVE-2025-47407 allows an attacker to execute arbitrary code on the DSP with elevated privileges. This can lead to a complete compromise of the affected device, allowing the attacker to steal sensitive data, install malware, or use the device as a launchpad for further attacks. The vulnerability can potentially impact a wide range of devices that utilize Qualcomm DSPs.

Recommendation

• Monitor process creation events for anomalies that may indicate a memory allocation failure, using the process_creation log category and filtering for processes related to the digital signal processor.
• Apply the security patch released by Qualcomm, as referenced in the advisory URL (https://docs.qualcomm.com/product/publicresources/securitybulletin/may-2026-bulletin.html), to address the memory corruption vulnerability.
• Deploy the Sigma rule provided below to detect potential exploitation attempts by monitoring for specific events related to process creation and memory allocation.

Attack Chain

1. An attacker gains local access to a vulnerable Qualcomm device.
2. The attacker crafts a malicious power management request with an oversized input buffer.
3. The crafted request is sent to the affected power management component.
4. The component processes the request without properly validating the buffer size.
5. Data from the oversized input buffer overflows into adjacent memory regions.
6. The attacker overwrites critical data structures or executable code within memory.
7. The system attempts to execute the corrupted code, leading to a crash or arbitrary code execution.
8. The attacker gains control of the device or escalates privileges.

Impact

Successful exploitation of CVE-2026-21382 could allow an attacker to execute arbitrary code on a vulnerable Qualcomm device. Although the number of affected devices and specific sectors are not specified in the provided source, the impact of successful exploitation includes potential device compromise, data theft, or denial of service. Due to the high CVSS score, unpatched systems are at significant risk.

Recommendation

• Monitor process creation events for power management-related processes spawning unexpected child processes, using a rule similar to the example below.
• Analyze network connections from power management-related processes for suspicious outbound traffic to unusual ports or IPs.
• Investigate any crashes or unexpected reboots on Qualcomm-based devices, correlating them with power management events in system logs.
• Monitor for registry modifications made by power management processes, specifically those related to loading custom drivers or libraries.
• Review and apply the security updates outlined in the Qualcomm security bulletin for April 2026 to patch CVE-2026-21382 (https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html).

Attack Chain

1. Attacker gains local access to a device with a vulnerable Qualcomm chipset, potentially through physical access or prior exploitation of another vulnerability.
2. The attacker crafts a malicious auxiliary sensor input/output control command.
3. The attacker sends the crafted command to the sensor processing module.
4. The sensor processing module attempts to process the command without proper buffer size validation.
5. Due to the insufficient validation, the module reads beyond the intended buffer, leading to a buffer over-read.
6. The memory corruption occurs, potentially overwriting critical data or code within the system’s memory.
7. If the overwritten memory contains executable code, the attacker can achieve arbitrary code execution with the privileges of the sensor processing module, which could be elevated.
8. The attacker gains control of the device or causes a denial-of-service by crashing the system.

Impact

Successful exploitation of CVE-2026-21374 can lead to arbitrary code execution with elevated privileges on affected devices. This could allow an attacker to install malware, steal sensitive data, or completely take control of the device. While the vulnerability requires local access, it poses a significant risk to devices that are frequently left unattended or are accessible to untrusted individuals. The number of potentially affected devices is substantial, given the widespread use of Qualcomm chipsets in mobile and IoT devices.

Recommendation

• Monitor for suspicious process creation events related to sensor processing modules or applications that interact with sensor data to identify potential exploitation attempts (see generic process_creation rule below, tune for specific Qualcomm binaries).
• Investigate any unexpected crashes or errors reported by sensor-related processes, as these could indicate memory corruption due to CVE-2026-21374.
• Apply security patches released by Qualcomm or device manufacturers as soon as they become available to address CVE-2026-21374 (reference: https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html).

Attack Chain

1. A malicious application is installed on a device with a vulnerable Qualcomm chipset.
2. The application gains the necessary permissions to interact with the device driver via IOCTL calls.
3. The malicious application crafts a specific IOCTL request with a small output buffer size.
4. The device driver processes the IOCTL request but fails to properly validate the output buffer size against the actual data being written.
5. The driver attempts to write data exceeding the allocated buffer size.
6. The excess data overwrites adjacent memory regions in kernel space.
7. This memory corruption can lead to a crash or, with careful manipulation, arbitrary code execution.

Impact

Successful exploitation of CVE-2026-21375 can result in a denial-of-service condition, where the device becomes unstable or unresponsive. In more severe scenarios, a local attacker could leverage the memory corruption to achieve arbitrary code execution with elevated privileges. Given the widespread use of Qualcomm chipsets in mobile devices and embedded systems, the potential impact could affect millions of devices globally.

Recommendation

• Apply the security patches released by Qualcomm as detailed in the April 2026 security bulletin to remediate CVE-2026-21375.
• Monitor process creation events for suspicious processes attempting to interact with device drivers, using the provided Sigma rule.
• Implement runtime validation of IOCTL buffer sizes within kernel drivers to prevent buffer overflows (mitigation, not detection).

Attack Chain

1. A malicious application is installed on the target device.
2. The application gains necessary privileges to interact with the camera sensor driver. This could potentially be achieved through exploiting other vulnerabilities or due to misconfigured permissions.
3. The application sends a crafted IOCTL request to the camera sensor driver.
4. The crafted IOCTL request triggers a specific function within the driver that accesses an output buffer.
5. The driver fails to validate the size of the output buffer before writing data to it.
6. Due to the insufficient size validation, the driver writes beyond the bounds of the allocated buffer, leading to a buffer over-read condition.
7. Memory corruption occurs as a result of the out-of-bounds write, potentially overwriting critical data structures or code.
8. An attacker may leverage the memory corruption to execute arbitrary code with the privileges of the camera sensor driver.

Impact

Successful exploitation of CVE-2026-21376 can lead to memory corruption and potentially allow a local attacker to execute arbitrary code with elevated privileges. The number of affected devices is currently unknown, but this vulnerability affects systems utilizing Qualcomm camera sensor drivers. A successful attack could compromise the integrity and confidentiality of the device, potentially leading to data theft, system instability, or complete device compromise.

Recommendation

• Apply the patches provided in the Qualcomm April 2026 Security Bulletin to remediate CVE-2026-21376. (Reference: https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html)
• Monitor process creation events for unusual processes spawned by camera-related drivers, using the Sigma rule provided below, to detect potential exploitation attempts.
• Implement runtime buffer size validation in camera drivers, to prevent future exploitation attempts.

Attack Chain

1. An attacker crafts a malicious FILS Discovery Frame with out-of-range action sizes.
2. The attacker transmits the crafted FILS Discovery Frame to a Qualcomm device during its initial network scan.
3. The Qualcomm device receives the malicious frame and attempts to process the out-of-range action size.
4. Due to improper bounds checking, the processing of the frame triggers a buffer over-read condition (CWE-126).
5. The buffer over-read leads to a temporary system instability.
6. The device experiences a transient denial-of-service condition.
7. The affected service becomes temporarily unavailable to legitimate users.
8. After a short period, the device recovers, and the service resumes normal operation.

Impact

Successful exploitation of CVE-2026-21367 leads to a transient denial-of-service condition on affected Qualcomm devices. The specific impact depends on the role of the device. This vulnerability has a CVSS v3.1 score of 7.6, indicating a high severity. While the DoS is transient, repeated exploitation could create a prolonged disruption, hindering user access and potentially affecting critical device functionalities.

Recommendation

• Monitor network traffic for malformed FILS Discovery Frames, specifically those with unusually large action sizes, using network monitoring tools (network_connection log source).
• Apply the patches or updates provided by Qualcomm as detailed in the April 2026 security bulletin to remediate CVE-2026-21367 (reference: https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html).
• Implement rate limiting on FILS Discovery Frame processing to mitigate the impact of malicious frames (network_connection log source).

Attack Chain

1. An attacker gains local access to a vulnerable device running a Qualcomm chipset.
2. The attacker triggers a specific function call that involves retrieving an output buffer.
3. Due to the insufficient size validation, the output buffer retrieval process reads beyond the allocated memory boundary (CWE-126).
4. The memory over-read allows the attacker to access sensitive data stored in adjacent memory regions.
5. The attacker analyzes the leaked memory contents to identify exploitable information, such as pointers, cryptographic keys, or other sensitive data.
6. Using the gained knowledge, the attacker crafts a malicious input to further exploit the vulnerability and achieve arbitrary code execution.
7. The attacker executes malicious code to gain elevated privileges or compromise the system.

Impact

A successful exploit of CVE-2026-21371 could result in information disclosure, where an attacker can read sensitive data from device memory. In a more severe scenario, it could lead to arbitrary code execution, potentially allowing an attacker to gain complete control of the affected device. The impact is significant for devices using vulnerable Qualcomm chipsets, potentially affecting a large number of mobile devices and other embedded systems.

Recommendation

• Monitor systems for unexpected memory access patterns, specifically buffer over-reads, using endpoint detection and response (EDR) solutions.
• Apply patches and updates released by Qualcomm for CVE-2026-21371 as soon as they become available. Refer to the Qualcomm security bulletin referenced in this brief.
• Deploy the Sigma rule “Detect Potential Buffer Over-Read Exploitation” to identify suspicious process creation events associated with abnormal memory access patterns.
• Enable process monitoring and auditing on systems utilizing Qualcomm chipsets to track memory access operations and identify potential exploitation attempts.

Attack Chain

Since no specific exploit details are provided in the source, the following attack chain describes the general steps involved in exploiting a stack-based buffer overflow when processing a frame request.

1. An attacker crafts a malicious frame request.
2. The frame request is sent to the vulnerable Qualcomm component.
3. The component’s software processes the frame request.
4. A stack-based buffer overflow occurs due to insufficient bounds checking when handling the request.
5. The attacker overwrites adjacent memory on the stack, including return addresses.
6. Upon function return, execution is redirected to attacker-controlled code.
7. The attacker executes arbitrary code, potentially gaining control of the device.

Impact

Successful exploitation of CVE-2025-47391 can lead to arbitrary code execution, potentially allowing an attacker to gain complete control over the affected device. Given the widespread use of Qualcomm components in mobile devices and other embedded systems, the impact could be significant, affecting a large number of users. The memory corruption vulnerability could allow for data theft, device compromise, and denial of service.

Recommendation

• Monitor network traffic for suspicious frame requests targeting Qualcomm-based devices, and deploy the network connection rule below to detect unusual outbound activity after potential exploitation.
• Analyze process memory for unusual code execution patterns, and implement the process creation rule to detect unexpected processes being launched.
• Review and apply the security updates provided in the Qualcomm Security Bulletin for April 2026 to patch CVE-2025-47391.
• Monitor for registry modifications indicative of persistence, using the registry_set rule below to detect unusual registry changes.

Attack Chain

1. A malicious application is installed on the target device.
2. The application crafts a specially crafted IOCTL request intended for the JPEG driver.
3. The application sends the malicious IOCTL request to the JPEG driver via the device’s operating system API.
4. The JPEG driver improperly processes the IOCTL request during the preprocessing stage.
5. Due to a buffer over-read (CWE-126), the driver reads beyond the allocated memory buffer.
6. This memory corruption could lead to a crash, denial of service, or the potential to overwrite adjacent memory regions.
7. If the attacker can control the overwritten memory, they may be able to inject and execute arbitrary code.

Impact

Successful exploitation of CVE-2025-47390 can lead to memory corruption, potentially resulting in a denial-of-service condition. In more severe scenarios, attackers could potentially gain arbitrary code execution and escalate their privileges on the targeted system. This vulnerability affects devices utilizing the vulnerable Qualcomm JPEG driver. The specific number of affected devices is unknown.

Recommendation

• Apply the patches released by Qualcomm as detailed in the Qualcomm Security Bulletin for April 2026 to remediate CVE-2025-47390.
• Monitor process creations for applications interacting with the JPEG driver using suspicious IOCTL requests to identify potential exploitation attempts (see the process creation Sigma rule below).
• Enable driver verifier on test systems to proactively identify driver-level memory corruption issues.

Attack Chain

1. A malicious application or process gains initial access to the system through a separate vulnerability or social engineering.
2. The malicious application triggers the performance counter functionality.
3. The application initiates a deselect operation on a specific performance counter.
4. During the deselect operation, the system attempts to copy data from a memory location associated with the performance counter.
5. Due to the vulnerability, the memory location has already been freed.
6. The copy operation attempts to read from the freed memory, resulting in a use-after-free condition.
7. This can lead to memory corruption, where arbitrary data is written to the freed memory region.
8. The memory corruption can be leveraged by the attacker to execute arbitrary code with the privileges of the affected process.

Impact

Successful exploitation of CVE-2026-24082 can lead to memory corruption and arbitrary code execution. This could allow a local attacker to gain elevated privileges on the system, potentially leading to data theft, system compromise, or denial of service. The vulnerability affects devices and systems utilizing vulnerable Qualcomm components. The exact number of affected devices is not specified, but the potential impact is significant given Qualcomm’s widespread presence in mobile, IoT, and automotive industries.

Recommendation

• Monitor for unusual activity related to performance counter operations, specifically process creation events associated with performance monitoring tools using the Sigma rule DetectSuspiciousPerformanceCounterDeselect.
• Investigate any instances of memory corruption or use-after-free errors, especially those occurring in Qualcomm-related processes, as indicated by system logs.
• Consult the Qualcomm security bulletin for affected product lists and recommended mitigations at the provided URL.
• Enable process creation logging to capture events necessary for the DetectSuspiciousPerformanceCounterDeselect rule.

Attack Chain

1. A malicious application is installed on the target device, leveraging existing permissions or exploiting other vulnerabilities for installation.
2. The malicious application gains low-level privileges, potentially through privilege escalation techniques, if necessary.
3. The application interacts with the camera sensor through input/output control codes (IOCTLs).
4. The application crafts a specific IOCTL request with an invalid output buffer size or memory address.
5. The camera sensor processing component attempts to write data to the invalid output buffer.
6. This write operation triggers a memory corruption condition due to the out-of-bounds access.
7. The memory corruption can lead to a denial of service, causing the device to crash or become unresponsive.
8. In more severe scenarios, the memory corruption could be leveraged to achieve arbitrary code execution, allowing the attacker to gain full control of the device.

Impact

Successful exploitation of CVE-2025-47405 can lead to a range of negative consequences, from denial of service to arbitrary code execution. If an attacker gains code execution, they could potentially steal sensitive data, install malware, or use the device as part of a botnet. The exact number of affected devices is unknown, but given Qualcomm’s widespread presence in mobile devices and other embedded systems, the potential impact is significant. Sectors affected would primarily be consumer electronics and potentially industrial control systems using affected Qualcomm components.

Recommendation

• Monitor for unexpected or malicious applications interacting with camera sensor devices, using process creation logs (logsource: process_creation, product: android).
• Implement endpoint detection rules to detect suspicious process memory access patterns potentially related to memory corruption attempts (logsource: process_creation, product: android).
• Refer to Qualcomm’s security bulletin for affected devices and patch information (references: https://docs.qualcomm.com/product/publicresources/securitybulletin/may-2026-bulletin.html).