CVE-2022-31146

高 8.8CVE-2022-31146 · 21/07/2022 公開 · 17/06/2026 更新

要点

CVE-2022-31146 は cranelift-codegen (bytecodealliance), wasmtime (bytecodealliance) に影響する深刻度「高」 (CVSS 8.8) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.3%（全脆弱性の 69.4% より高い）。
対処：0.85.2, 0.38.2 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
cranelift-codegen bytecodealliance	`≥ 0.84.0, < 0.85.2`	`0.85.2`
wasmtime bytecodealliance	`≥ 0.37.0, < 0.38.2`	`0.38.2`

概要

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.