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

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.

Source published

12 Oct 2026 17:01:16 UTC

Source modified

19 Oct 2026 11:04:47 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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