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CVE-2016-2853 describes a local privilege escalation vulnerability in the Linux kernel's aufs module (3.x and 4.x), but the provided context focuses on a related exploit (unsanitary.sh) that targets setuid root binaries compiled with AddressSanitizer (ASAN). The vulnerability arises from improper sanitization of environment variables by ASAN in setuid binaries, allowing a local attacker to overwrite /etc/ld.so.preload with a malicious shared library. This results in arbitrary code execution as root when the system loads the malicious library. The exploit leverages symlink spraying to increase the likelihood of overwriting the preload file and requires a setuid root binary compiled with ASAN, which is not common in production but may exist in development or testing environments.
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