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heap-buffer-overflow in onnx-ort-format (id:000025,sig:06,src:000003+000011,time:18209060,execs:114108864,op:splice,rep:1)

Severity: high CWE: CWE-122 Target: onnx-ort-format Generated: 2026-03-01

Summary

heap-buffer-overflow in onnx-ort-format (id:000025,sig:06,src:000003+000011,time:18209060,execs:114108864,op:splice,rep:1). See ASAN output below for details.

Reproduction

chmod +x reproduce.sh
./reproduce.sh

Or manually:

# Build target with ASAN
# Run: <target> poc.ort

PoC File

poc.ort (143 bytes)

ASAN Output

Testing: /home/rammdaeus/huntr/fuzz-output/onnx-ort-format/main/crashes/id:000025,sig:06,src:000003+000011,time:18209060,execs:114108864,op:splice,rep:1 (143 bytes)
=================================================================
==3240134==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x769d07644c00 at pc 0x7a1d0d1435b4 bp 0x7fff327f2d10 sp 0x7fff327f2d00
READ of size 16 at 0x769d07644c00 thread T0
    #0 0x7a1d0d1435b3 in _mm_loadu_ps(float const*) /usr/lib/gcc/x86_64-linux-gnu/15/include/xmmintrin.h:982
    #1 0x7a1d0d1435b3 in MlasLoadFloat32x4(float const*) /home/rammdaeus/gor/hunting/targets/onnxruntime/onnxruntime/core/mlas/lib/mlasi.h:2104
    #2 0x7a1d0d1435b3 in void MlasSgemmTransposePackBNx4<8u>(float*, float const*, unsigned long) /home/rammdaeus/gor/hunting/targets/onnxruntime/onnxruntime/core/mlas/lib/sgemm.cpp:395
    #3 0x7a1d0d13ec81 in MlasSgemmTransposePackB(float*, float const*, unsigned long, unsigned long, unsigned long) (/home/rammdaeus/huntr/libs/onnx/libonnxruntime.so.1+0x3d3ec81) (BuildId: 06133089d904988c5bacaadc701d1137241257f4)
    #4 0x7a1d0d140f05 in MlasSgemmOperation(CBLAS_TRANSPOSE, CBLAS_TRANSPOSE, unsigned long, unsigned long, unsigned long, float, float const*, unsigned long, float const*, unsigned long, float, float*, unsigned long) (/home/rammdaeus/huntr/libs/onnx/libonnxruntime.so.1+0x3d40f05) (BuildId: 06133089d904988c5bacaadc701d1137241257f4)
    #5 0x7a1d0d1426a6 in MlasSgemmThreaded(long, long, CBLAS_TRANSPOSE, CBLAS_TRANSPOSE, unsigned long, unsigned long, unsigned long, MLAS_SGEMM_DATA_PARAMS const*, long) (/home/rammdaeus/huntr/libs/onnx/libonnxruntime.so.1+0x3d426a6) (BuildId: 06133089d904988c5bacaadc701d1137241257f4)
    #6 0x7a1d0d142928 in MlasGemmBatch(CBLAS_TRANSPOSE, CBLAS_TRANSPOSE, unsigned long, unsigned long, unsigned long, MLAS_SGEMM_DATA_PARAMS const*, unsigned long, onnxruntime::concurrency::ThreadPool*)::{lambda(long)#1}::operator()(long) const (/home/rammdaeus/huntr/libs/onnx/libonnxruntime.so.1+0x3d42928) (BuildId: 06133089d904988c5bacaadc701d1137241257f4)
    #7 0x7a1d0d1449fa in __invoke_impl<void, MlasGemmBatch(CBLAS_TRANSPOSE, CBLAS_TRANSPOSE, size_t, size_t, size_t, const MLAS_SGEMM_DATA_PARAMS*, size_t, MLAS_THREADPOOL*)::<lambda(ptrdiff_t)>&, long int> /usr/include/c++/15/bits/invoke.h:63
    #8 0x7a1d0d144872 in __invoke_r<void, MlasGemmBatch(CBLAS_TRANSPOSE, CBLAS_TRANSPOSE, size_t, size_t, size_t, const MLAS_SGEMM_DATA_PARAMS*, size_t, MLAS_THREADPOOL*)::<lambda(ptrdiff_t)>&, long int> /usr/include/c++/15/bits/invoke.h:113
    #9 0x7a1d0d1445b4 in _M_invoke /usr/include/c++/15/bits/std_function.h:292
    #10 0x7a1d0a821fcf in std::function<void (long)>::operator()(long) const /usr/include/c++/15/bits/std_function.h:593
    #11 0x7a1d0d603116 in MlasTrySimpleParallel(onnxruntime::concurrency::ThreadPool*, long, std::function<void (long)> const&) /home/rammdaeus/gor/hunting/targets/onnxruntime/onnxruntime/core/mlas/lib/threading.cpp:71
    #12 0x7a1d0d142ead in M

Impact

Memory corruption vulnerability reachable by processing a malformed onnx-ort-format file. An attacker could craft a malicious file and distribute it to cause denial of service or potentially leak sensitive heap data.

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