{"id":"UBUNTU-CVE-2026-42627","details":"In Arm ArmNN through 2026-03-27, an integer overflow in TensorShape::GetNumElements() in armnn/Tensor.cpp allows a crafted TFLite model file to bypass buffer size validation and trigger a heap-based buffer over-read during model optimization. The overflow occurs when multiplying tensor dimensions using 32-bit unsigned arithmetic without overflow detection, causing GetNumBytes() to return an understated allocation size. During Optimize()-\u003eInferOutputShapes(), the BatchToSpaceNdLayer reads beyond the allocated buffer.","modified":"2026-05-27T19:15:22.745013894Z","published":"2026-05-22T18:16:00Z","upstream":["CVE-2026-42627"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42627"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-42627"},{"type":"REPORT","url":"https://github.com/ARM-software/armnn/blob/main/src/armnn/Tensor.cpp"},{"type":"REPORT","url":"https://github.com/ARM-software/armnn/blob/main/src/armnnTfLiteParser/TfLiteParser.cpp"}],"affected":[{"package":{"name":"armnn","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/armnn?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.08-9","20.08-10","20.08-10build1"],"ecosystem_specific":{"binaries":[{"binary_version":"20.08-10build1","binary_name":"libarmnn-cpuacc-backend22"},{"binary_version":"20.08-10build1","binary_name":"libarmnn-cpuref-backend22"},{"binary_name":"libarmnn-gpuacc-backend22","binary_version":"20.08-10build1"},{"binary_version":"20.08-10build1","binary_name":"libarmnn22"},{"binary_version":"20.08-10build1","binary_name":"libarmnnaclcommon22"},{"binary_name":"libarmnntfliteparser22","binary_version":"20.08-10build1"},{"binary_version":"20.08-10build1","binary_name":"python3-pyarmnn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42627.json"}},{"package":{"name":"armnn","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/armnn?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.08-3","23.08-4","23.08-4build1","23.08-4.1","23.08-4.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"armnn-latest-all","binary_version":"23.08-4.1build1"},{"binary_name":"armnn-latest-cpu","binary_version":"23.08-4.1build1"},{"binary_version":"23.08-4.1build1","binary_name":"armnn-latest-cpu-gpu"},{"binary_name":"armnn-latest-cpu-gpu-ref","binary_version":"23.08-4.1build1"},{"binary_name":"armnn-latest-gpu","binary_version":"23.08-4.1build1"},{"binary_version":"23.08-4.1build1","binary_name":"armnn-latest-ref"},{"binary_name":"libarmnn-cpuacc-backend33","binary_version":"23.08-4.1build1"},{"binary_name":"libarmnn-cpuref-backend33","binary_version":"23.08-4.1build1"},{"binary_name":"libarmnn-gpuacc-backend33","binary_version":"23.08-4.1build1"},{"binary_version":"23.08-4.1build1","binary_name":"libarmnn33t64"},{"binary_name":"libarmnnaclcommon33t64","binary_version":"23.08-4.1build1"},{"binary_name":"libarmnntfliteparser24t64","binary_version":"23.08-4.1build1"},{"binary_name":"python3-pyarmnn","binary_version":"23.08-4.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42627.json"}},{"package":{"name":"armnn","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/armnn?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.08-5"],"ecosystem_specific":{"binaries":[{"binary_version":"23.08-5","binary_name":"armnn-latest-all"},{"binary_version":"23.08-5","binary_name":"armnn-latest-cpu"},{"binary_name":"armnn-latest-cpu-gpu","binary_version":"23.08-5"},{"binary_version":"23.08-5","binary_name":"armnn-latest-cpu-gpu-ref"},{"binary_version":"23.08-5","binary_name":"armnn-latest-gpu"},{"binary_name":"armnn-latest-ref","binary_version":"23.08-5"},{"binary_name":"libarmnn-cpuacc-backend33","binary_version":"23.08-5"},{"binary_version":"23.08-5","binary_name":"libarmnn-cpuref-backend33"},{"binary_name":"libarmnn-gpuacc-backend33","binary_version":"23.08-5"},{"binary_name":"libarmnn33t64","binary_version":"23.08-5"},{"binary_name":"libarmnnaclcommon33t64","binary_version":"23.08-5"},{"binary_name":"libarmnntfliteparser24t64","binary_version":"23.08-5"},{"binary_name":"python3-pyarmnn","binary_version":"23.08-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42627.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}