CVE-2026-70640

llama.cpp: llama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Android JNI w...

CVE-2026-70640 is fixed in llama.cpp on 1 platform by DEBIAN-CVE-2026-70640 (version 7593+dfsg-1), released August 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
n/a
No vendor severity
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0024
15th percentile

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 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.

Where it's fixed

ProductFixed inFixReleased
Linux
llama.cpp · Debian 14 7593+dfsg-1 DEBIAN-CVE-2026-70640 Aug 7, 2026

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