CVE-2026-20569 in MT6858
Summary
by MITRE • 11/02/2026
In adsp, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11431474; Issue ID: MSV-9927.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in the adsp component represents a critical memory safety flaw classified as a use-after-free condition, which poses significant risks to system integrity and confidentiality within Android-based environments. This specific issue arises when the application continues to access or manipulate a block of memory after it has been freed back to the system allocator. In the context of the adsp subsystem, this typically involves pointers that are not properly nullified or updated following deallocation operations, allowing subsequent code paths to interact with stale references. Such behavior is inherently dangerous because the memory previously occupied by the original object may have been reallocated for a different purpose, leading to unpredictable data corruption when the old pointer is dereferenced. This type of flaw falls squarely under CWE-416, which defines use after free as an error where software uses memory after it has been freed, often resulting in crashes or arbitrary code execution depending on how the attacker can control the reallocation and subsequent access patterns.
From a technical perspective, exploitation of this vulnerability requires the adversary to have already achieved System privilege level within the operating system environment. This prerequisite indicates that the flaw is not remotely exploitable nor does it allow for initial unauthorized entry from lower-privileged contexts such as standard user applications or untrusted services. Instead, it serves as an escalation vector where a compromised process with high-level access can leverage this memory corruption to further destabilize the kernel or gain control over critical system resources that were previously protected by privilege boundaries. The absence of required user interaction means that once the attacker has obtained System privileges through any other means, they can trigger the vulnerable code path autonomously without needing social engineering tactics or physical presence at the device interface. This characteristic aligns with ATT&CK technique T1068, which covers exploitation for privilege escalation, specifically highlighting how internal flaws are leveraged to expand existing access rights rather than establishing initial footholds from external networks.
The operational impact of this vulnerability is primarily centered on local privilege escalation and potential denial of service conditions stemming from memory corruption. While the immediate threat model assumes prior System-level compromise, the existence of such a flaw indicates deeper architectural weaknesses in how adsp manages dynamic memory allocation and deallocation cycles. If exploited effectively, an attacker could corrupt kernel data structures or critical system variables, leading to complete loss of device integrity. This might manifest as random application crashes, system reboots, or more severe outcomes where the attacker gains unrestricted read-write access to sensitive areas of memory that should remain isolated even from System-level processes due to additional security layers like SELinux policies being bypassed through kernel panic conditions or control flow hijacking via corrupted pointers. The lack of user interaction requirement exacerbates this risk by allowing automated scripts or background malware to execute the exploit chain silently, making detection and mitigation more challenging for endpoint protection solutions that rely on behavioral anomalies triggered by human activity.
Mitigation strategies must focus primarily on applying the vendor-provided patch identified as ALPS11431474, which addresses the underlying memory management logic within adsp to ensure proper pointer invalidation after free operations. Security teams should verify that this update is deployed across all affected devices in their inventory and monitor for any indicators of compromise suggesting attempts to exploit similar patterns in adjacent components. Additionally, implementing strict enforcement of security policies such as SELinux can help contain the blast radius if an attacker manages to trigger memory corruption by restricting what resources a compromised System-level process can access. Regular code audits focusing on lifecycle management of dynamically allocated objects and adopting static analysis tools that detect use-after-free scenarios during development phases are essential preventive measures. Organizations should also consider reducing attack surface by disabling unnecessary services within adsp unless explicitly required, thereby limiting the potential entry points for internal exploitation attempts even when higher privileges have been compromised through other vectors.