A sign extension error exists in the PPC64le Foreign Function Interface (FFI) of the Glasgow Haskell Compiler (GHC) in certain versions. This flaw can cause numeric arguments in FFI calls to have incorrect runtime values, leading primarily to availability and data integrity issues. Under some conditions, it may also result in more severe security problems such as buffer overflow vulnerabilities. Fixed versions addressing this issue are 9.6.6, 9.8.3, and 9.10.2.