CVE-2022-31146

published 2022-07-21

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…

Priority P3 49 high 8.8 CVSS 3.1

AV N AC L PR L UI N S U C H I H A H

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.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
bytecodealliance	cranelift-codegen	>= 0.84.0 < 0.85.2	0.85.2
bytecodealliance	cranelift-codegen	>= 0.84.0 < 0.85.2	0.85.2
bytecodealliance	wasmtime	—	—
bytecodealliance	wasmtime	—	—
bytecodealliance	wasmtime	>= 0.0.0-0 < 0.38.2	0.38.2
bytecodealliance	wasmtime	>= 0.37.0 < 0.38.2	0.38.2
bytecodealliance	wasmtime	>= 0.37.0 < 0.38.2	0.38.2
debian	rust-wasmtime	—	—

CVSS provenance

nvd v3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv 8.8 HIGH

vendor_debian 6.4 LOW

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-416