CVE-2022-31146

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Summary

CVECVE-2022-31146
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-07-21 04:15:00 UTC
Updated2022-07-27 22:42:00 UTC
DescriptionWasmtime 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.

Risk And Classification

Problem Types: CWE-416

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Bytecodealliance Cranelift-codegen All All All All
Application Bytecodealliance Wasmtime All All All All

References

ReferenceSourceLinkTags
Use After Free with `externref`s in Wasmtime · Advisory · bytecodealliance/wasmtime · GitHub CONFIRM github.com
GitHub - WebAssembly/reference-types: Proposal for adding basic reference types (anyref) MISC github.com
GitHub - bytecodealliance/wasmtime: A standalone runtime for WebAssembly MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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