---
cve: "CVE-2026-70640"
severity: "HIGH"
cvss: 7.3
epss: "16%"
vendor: "ggml-org"
kev: false
exploited: false
published: "2026-08-06 22:18:28"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T07:14:53+02:00"
---

# CVE-2026-70640

> 7.3 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 4b2a4778f81f222c12271ce3b1997990b3071faf (Commit)
- 5c0d18881e0e9794c96b2602736b758bac9d9388 (Commit)

## Referenzen

- <https://github.com/ggml-org/llama.cpp/releases/tag/b7446>
- <https://github.com/ggml-org/llama.cpp/commit/5c0d18881e0e9794c96b2602736b758bac9d9388>
- <https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches>
- <https://www.vulncheck.com/advisories/llama-cpp-b1886-b7445-race-condition-use-after-free-via-llama-android-cpp>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-70640) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_