CVE-2022-31146

Wasmtime is a standalone runtime for WebAssembly. There is a bug in the
Wasmtime’s code generator, Cranelift, where functions using reference types
may be incorrectly missing metadata required for runtime garbage
collection. This means that if a GC happens at runtime then the GC pass
will mistakenly think these functions do not have live references to GC’d
values, reclaiming them and deallocating them. The function will then
subsequently continue to use the values assuming they had not been GC’d,
leading later to a use-after-free. This bug was introduced in the migration
to the regalloc2 register allocator that occurred in the Wasmtime 0.37.0
release on 2022-05-20. This bug has been patched and users should upgrade
to Wasmtime version 0.38.2. Mitigations for this issue can be achieved by
disabling the reference types proposal by passing false to
wasmtime::Config::wasm_reference_types or downgrading to Wasmtime 0.36.0
or prior.

Notes