CVE-2026-70638: llama.cpp b1886–b7445 Integer Overflow via new_1batch() in llama-android.cpp

llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-Android JNI wrapper where the new1batch() function multiplies sizeof(llamaseqid) by an attacker-controlled nseqmax parameter without overflow validation, causing heap buffer allocation to wrap and allocate insufficient memory. Attackers can exploit this by providing a crafted nseqmax value through a malicious model file or JNI call to trigger heap corruption and achieve denial of service or arbitrary code execution on Android applications using the LLaMA-Android binding.