{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "b1886"
              },
              {
                "fixed": "b7445"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "862f5e41ab1fdf12d6f59455aad3f5dd8258f805"
            },
            {
              "fixed": "4b2a4778f81f222c12271ce3b1997990b3071faf"
            },
            {
              "fixed": "5c0d18881e0e9794c96b2602736b758bac9d9388"
            }
          ],
          "repo": "https://github.com/ggml-org/llama.cpp",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-362",
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70640.json"
  },
  "details": "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.",
  "id": "CVE-2026-70640",
  "modified": "2026-08-12T03:51:28.786451715Z",
  "published": "2026-08-06T15:38:22.994Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70640.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ggml-org/llama.cpp/releases/tag/b7446"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70640"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/llama-cpp-b1886-b7445-race-condition-use-after-free-via-llama-android-cpp"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ggml-org/llama.cpp/commit/5c0d18881e0e9794c96b2602736b758bac9d9388"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "llama.cpp b1886–b7445 Race Condition Use-After-Free via llama-android.cpp"
}