CVE-2026-70640

Code execution via unsynchronized JNI context release

Published Aug 6, 2026 · Updated Aug 6, 2026

Race-condition use-after-free in llama.cpp 0.9.0 through 0.17.1 allows attackers to execute code through the Android JNI wrapper. The bench_1model() and free_1context() JNI paths access and free the same llama_context without synchronization, letting llama_batch_allocr::clear() dereference attacker-controlled freed memory. Triggering the race requires concurrent benchmark and context-release operations plus user interaction; successful exploitation runs code in the Android app process.

CVSS severity7.3
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race-condition use-after-free in llama.cpp 0.9.0 through 0.17.1 allows attackers to execute code through the Android JNI wrapper. The bench_1model() and free_1context() JNI paths access and free the same llama_context without synchronization, letting llama_batch_allocr::clear() dereference attacker-controlled freed memory. Triggering the race requires concurrent benchmark and context-release operations plus user interaction; successful exploitation runs code in the Android app process.

The record

CVE
CVE-2026-70640
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Georgi Gerganov
Product
llama.cpp
Classifications
CWE-362, CAPEC-26, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.9.0 <=0.17.1
  2. Affected versionversion=b1886 <=b7445

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Georgi Gerganov · llama.cppversion=0.9.0 <=0.17.1; version=b1886 <=b7445

Published CVSS scores

7.3NVDCVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC-26Leveraging Race Conditions
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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