Medium [CVE-2026-70639] Denial of Service in Android JNI wrapper via malicious model file
This medium-severity Red Hat Linux advisory covers CVE-2026-70639.
Android app · Google Play
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Summary
llama.cpp builds b1886 through b7445 contain a null pointer dereference vulnerability in the LLaMA-Android JNI wrapper where the bench_1model() function fails to validate the model context pointer before dereferencing it.
Attackers can supply a malicious, corrupt, or truncated model file to trigger a null context condition, causing a SIGSEGV crash that terminates the Android application process and results in denial of service.
This flaw allows an attacker to provide a malicious or corrupt model file, which causes the `bench_1model()` function to attempt to use an invalid memory address.
This leads to a crash of the Android application, resulting in a denial of service (DoS) where the application becomes unavailable. llama.cpp is packaged for Fedora (python-llama-cpp-python, ollama, llama-cpp) as Linux command-line/library builds.
This flaw is specific to the LLaMA-Android JNI wrapper's bench_1model() function, which is Android-only code that is not compiled or reachable in the standard Linux RPM builds. No Red Hat/community product is affected.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-476.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- No mitigation is necessary; the Android-specific vulnerable code path is not present in the shipped Linux packages.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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