CVE-2026-84286

OOB Read/Write via Negative Array Index in exllamav3_ext Kernel Table

Published Oct 12, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
ExLlamaV3’s EXL3 loader uses an untrusted, model-supplied index to select a CUDA kernel without first verifying that the index is within bounds. A malicious model can force the code to read and invoke an out‑of‑range function pointer, resulting in a reproducible crash. Under specific conditions involving certain host memory layouts, it may be possible for an attacker to exploit this vulnerability to achieve controlled indirect kernel dispatch during model load.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-125
CWE-20
CWE-787
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Turboderp-org
Turboderp-org exllamav3
Vendors & Products Turboderp-org
Turboderp-org exllamav3
Type Values Removed Values Added
Weaknesses CWE-126
CWE-188
Type Values Removed Values Added
Description ExLlamaV3’s EXL3 loader uses an untrusted, model-supplied index to select a CUDA kernel without first verifying that the index is within bounds. A malicious model can force the code to read and invoke an out‑of‑range function pointer, resulting in a reproducible crash. Under specific conditions involving certain host memory layouts, it may be possible for an attacker to exploit this vulnerability to achieve controlled indirect kernel dispatch during model load.
Title OOB Read/Write via Negative Array Index in exllamav3_ext Kernel Table
References

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Oct 19, 2026, 11:04 AM
Reserved
Sep 1, 2026, 3:47 PM
Status
Awaiting Analysis
Published
Oct 12, 2026, 5:17 PM
Modified
Oct 19, 2026, 12:17 PM