Attack Chain

1. An attacker identifies a target system running a vulnerable Linux Kernel version, such as 5.15.149-android13, which is susceptible to the CVE-2026-43499 Use-After-Free flaw.
2. To circumvent Kernel Address Space Layout Randomization (KASLR), the attacker leverages kernel mechanisms, specifically perf_event_open combined with callchain sampling, to leak kernel memory addresses.
3. The attacker analyzes the obtained call chain data, including maximum single frame depth (e.g., 0x1F0), to accurately determine the randomized base address of the kernel or critical kernel objects.
4. A malicious sequence of operations or specific kernel calls is crafted to trigger the Use-After-Free condition inherent in CVE-2026-43499. This involves deallocating a kernel memory region and then re-using it for controlled malicious purposes.
5. By manipulating the freed and subsequently reallocated memory, the attacker corrupts essential kernel data structures, such as process credentials, task control blocks, or function pointers.
6. The memory corruption enables the attacker to execute arbitrary code within kernel mode or modify their process's privileges to gain full root access on the compromised system.
7. With kernel-level control, the attacker can proceed with post-exploitation activities, including installing persistent backdoors, exfiltrating sensitive data, or further compromising the system's integrity.

Impact

Successful exploitation of CVE-2026-43499 grants an attacker full root privileges on the affected Linux system, leading to complete system compromise. This allows for arbitrary code execution in kernel mode, enabling the attacker to bypass all security controls, access or modify any data, install malware, or establish persistence. The presence of a public exploit targeting specific Android devices (OPPO Find X6 Pro) indicates a clear path for attackers to compromise mobile devices running affected kernel versions. The impact extends to data breaches, unauthorized access, and potential denial of service, with severe consequences for data confidentiality, integrity, and availability.

Recommendation

• Patch CVE-2026-43499 immediately on all affected Linux Kernel systems and Android devices to prevent exploitation of the Use-After-Free vulnerability.
• Monitor for unusual or excessive usage of perf_event_open on Linux systems, particularly if originating from unprivileged processes, as this is used in the KASLR bypass technique described.
• Review kernel source code updates for Linux Kernel 5.15.149-android13 and subsequent versions to ensure the GhostLock vulnerability is addressed.
• Block access to the exploit sources listed in the IOC table at the network perimeter or endpoint detection solutions to prevent download and execution.