{"id":"CVE-2026-70640","title":"llama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Android JNI wrapper where bench_1model() and free_1context() lack synchronization, allowing Thread A to operate on freed memory while…","summary":"llama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Android JNI wrapper where bench_1model() and free_1context() lack synchronization, allowing Thread A to operate on freed memory while…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-362","CWE-476"],"vendor":"ggml","product":"llama.cpp","affected":["llama.cpp >= b1886, <= b7445"],"published":"2026-08-06","updated":"2026-09-21","sourceUpdated":"2026-09-21T18:10:49.043","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70640","references":[{"url":"https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ggml-org/llama.cpp/commit/5c0d18881e0e9794c96b2602736b758bac9d9388","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ggml-org/llama.cpp/releases/tag/b7446","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/llama-cpp-b1886-b7445-race-condition-use-after-free-via-llama-android-cpp","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.0016,"epssPercentile":0.05541,"ingestedAt":"2026-09-21T18:50:57.547Z","slug":"CVE-2026-70640","body":"## Overview\n\nllama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Android JNI wrapper where bench_1model() and free_1context() lack synchronization, allowing Thread A to operate on freed memory while Thread B concurrently frees the llama_context. Attackers can exploit this by performing heap spray with attacker-controlled data containing a fake vtable to hijack the vtable pointer at offset +0x30, causing llama_batch_allocr::clear() to dereference arbitrary memory and achieve remote code execution.\n\n## Affected\n\n- `llama.cpp >= b1886, <= b7445`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}