Local information disclosure via missing bounds check

Information disclosure in keyinstall on MediaTek chipsets running Android 11.0, 12.0, or 13.0 allows local users to read local data. The keyinstall component processes attacker-controlled input without checking its bounds, causing information outside the intended range to be disclosed. The attacker must already hold System execution privileges; no user interaction is required, and the flaw provides disclosure rather than privilege escalation.