Go cmd/compile no-op interface conversion bypasses overlap checking
CVE-2026-27144 is a vulnerability in the Go compiler (cmd/compile) in which the compiler failed to unwrap pointers contained within a no-op interface conversion when determining whether a memory move was non-overlapping. As a result, code patterns involving assignments such as composite-value moves could be misclassified as safe non-overlapping copies even when the source and destination memory regions could overlap. This caused the compiler to select an unsafe move path instead of a careful copy path for overlapping composite values, potentially introducing memory corruption at runtime in programs written in otherwise safe Go code. The fix changes the compiler to unwrap all such no-op interface conversions before deciding whether a move is non-overlapping.
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