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Vulnerabilities CVE-2026-70640

CVE-2026-70640

High
Open
TLP:CLEAR

llama.cpp b1886–b7445 Race Condition Use-After-Free via llama-android.cpp

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Description

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.

Details

CVSS Score
7.3
EPSS Score
0.16%

5.6th percentile

CVSS Vector
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 6, 2026
Last Modified
Aug 7, 2026
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