# SEGV in tflite-xnnpack (id:002045,sig:11,src:017289,time:386308252,execs:793762515,op:havoc,rep:1)

**Severity:** medium
**CWE:** CWE-119
**Target:** tflite-xnnpack
**Generated:** 2026-02-27

## Summary

SEGV in tflite-xnnpack (id:002045,sig:11,src:017289,time:386308252,execs:793762515,op:havoc,rep:1). See ASAN output below for details.

## Reproduction

```bash
chmod +x reproduce.sh
./reproduce.sh
```

Or manually:
```bash
# Build target with ASAN
# Run: <target> poc.tflite
```

## PoC File

- `poc.tflite` (640 bytes)

## ASAN Output

```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==533051==ERROR: AddressSanitizer: SEGV on unknown address 0x509026aaac00 (pc 0x75f3c71a1be3 bp 0x7fff00ff8520 sp 0x7fff00ff7ce8 T0)
==533051==The signal is caused by a WRITE memory access.
    #0 0x75f3c71a1be3 in __memset_avx512_unaligned_erms string/../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:216
    #1 0x58c2945e5370 in __asan_memset (/home/lab/huntr/harnesses/tflite/fuzz_tflite_xnnpack_v2+0x9b6370) (BuildId: 379682ff8803bcfee7b5e3bcbfcfe3d55390c609)
    #2 0x58c294da3bc3 in gemmlowp::PackSideBlockImpl<gemmlowp::SideMap<unsigned char const, (gemmlowp::SideMapOrder)0>, gemmlowp::PackedSideBlock<gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>>>::PackL2() /home/lab/huntr/targets/tflite/build-afl/gemmlowp/public/../internal/pack.h:320:5
    #3 0x58c294de9280 in void gemmlowp::PackRhs<gemmlowp::PackedSideBlock<gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>>, gemmlowp::MatrixMap<unsigned char const, (gemmlowp::MapOrder)0>>(gemmlowp::PackedSideBlock<gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>>*, gemmlowp::MatrixMap<unsigned char const, (gemmlowp::MapOrder)0> const&) /home/lab/huntr/targets/tflite/build-afl/gemmlowp/public/../internal/pack.h:429:8
    #4 0x58c294de9280 in void gemmlowp::SingleThreadGemm<gemmlowp::KernelFormat<gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>, gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>>, unsigned char, unsigned char, gemmlowp::BitDepthParams<gemmlowp::OperandRange<1, 255>, gemmlowp::OperandRange<0, 255>>, (gemmlowp::MapOrder)1, (gemmlowp::MapOrder)0, (gemmlowp::MapOrder)1, gemmlowp::VectorDup<int const, (gemmlowp::VectorShape)1>, gemmlowp::VectorDup<int const, (gemmlowp::VectorShape)0>, std::tuple<gemmlowp::OutputStageScaleInt32ByFixedPointAndExponent, gemmlowp::OutputStageClamp, gemmlowp::OutputStageSaturatingCastToUint8>>(gemmlowp::SingleThreadGemmContext*, gemmlowp::KernelBase const&, gemmlowp::MatrixMap<unsigned char const, (gemmlowp::MapOrder)1> const&, gemmlowp::MatrixMap<unsigned char const, (gemmlowp::MapOrder)0> const&, gemmlowp::MatrixMap<unsigned char, (gemmlowp::MapOrder)1>*, gemmlowp::VectorDup<int const, (gemmlowp::VectorShape)1> const&, gemmlowp::VectorDup<int const, (gemmlowp::VectorShape)0> const&, std::tuple<gemmlowp::OutputStageScaleInt32ByFixedPointAndExponent, gemmlowp::OutputStageClamp, gemmlowp::OutputStageSaturatingCastToUint8> const&) /home/lab/huntr/targets/tflite/build-afl/gemmlowp/public/../internal/single_thread_gemm.h:127:5
    #5 0x58c294de7c86 in void gemmlowp::MultiThreadGemm<gemmlowp::KernelFormat<gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>, gemmlowp::KernelSideFormat<gemmlowp::CellFormat<4, 16, (gemmlowp::CellOrder)1>, 1>>, unsigned char, unsigned char, gemmlo
```

## Impact

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