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.
References
Link | Resource |
---|---|
https://github.com/WebAssembly/reference-types | Third Party Advisory |
https://github.com/bytecodealliance/wasmtime/ | Product Third Party Advisory |
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5fhj-g3p3-pq9g | Mitigation Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
No history.
Information
Published : 2022-07-21 04:15
Updated : 2024-02-28 19:29
NVD link : CVE-2022-31146
Mitre link : CVE-2022-31146
CVE.ORG link : CVE-2022-31146
JSON object : View
Products Affected
bytecodealliance
- cranelift-codegen
- wasmtime
CWE
CWE-416
Use After Free