Improper Input Validation in libsubextractor.so Leading to Out-of-Bounds Write

Executive Summary

This vulnerability is an improper input validation issue in the subtitle frame loading function of libsubextractor.so. It exists in versions prior to the Samsung Mobile September 2026 Release 1. The flaw allows local attackers to write memory outside the intended bounds, potentially causing memory corruption or crashes.

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Detection Guidance

This vulnerability involves improper input validation in libsubextractor.so leading to out-of-bounds memory writes. Detection requires checking for vulnerable versions of the library on your system. Use commands like 'find / -name libsubextractor.so 2>/dev/null' to locate the library and 'strings [library_path] | grep -i version' to check its version against the SMR Sep-2026 Release 1 or later.

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Impact Analysis

Local attackers could exploit this to corrupt memory on the device, leading to application crashes or potentially enabling further malicious activities. Since it requires local access, the immediate risk is higher for users with untrusted local access or compromised devices.

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Compliance Impact

This vulnerability involves improper input validation leading to out-of-bounds memory writes, which could allow local attackers to manipulate memory. Such issues may impact compliance by potentially exposing sensitive data or disrupting system integrity, though specific effects on GDPR or HIPAA depend on deployment context and mitigations in place.

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Mitigation Strategies

Immediately update to the SMR Sep-2026 Release 1 or later to patch the vulnerability. If updating is not immediately possible, restrict local access to the affected library or disable subtitle processing features until the update is applied.

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