CVE-2022-31169

Cranelift vulnerable to miscompilation of constant values in division on AArch64

HIGH

7.5

CVSS Score

Published: July 21, 2022 at 01:50 PM UTC

Updated: June 17, 2026 at 04:44 AM UTC

2 products affected across 1 vendorWasmtimeCranelift Codegen

Using wasmtime by bytecodealliance?

Get instant alerts when new vulnerabilities affect wasmtime - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.5

Exploit prediction

EPSS 0.9%

SSVC

No known exploit

Description

Wasmtime is a standalone runtime for WebAssembly. There is a bug in Wasmtime's code generator, Cranelift, for AArch64 targets where constant divisors can result in incorrect division results at runtime. This affects Wasmtime prior to version 0.38.2 and Cranelift prior to 0.85.2. This issue only affects the AArch64 platform. Other platforms are not affected. The translation rules for constants did not take into account whether sign or zero-extension should happen which resulted in an incorrect value being placed into a register when a division was encountered. The impact of this bug is that programs executing within the WebAssembly sandbox would not behave according to the WebAssembly specification. This means that it is hypothetically possible for execution within the sandbox to go awry and WebAssembly programs could produce unexpected results. This should not impact hosts executing WebAssembly but does affect the correctness of guest programs. This bug has been patched in Wasmtime version 0.38.2 and cranelift-codegen 0.85.2. There are no known workarounds.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cranelift Codegen · Bytecodealliancecargo

95%

v < 0.85.1

Affected range stops below 0.85.1, so it looks safe — our inference, not a vendor statement

Wasmtime · Bytecodealliancecargo

95%

v < 0.38.1v < 0.38.2v < 0.85.2

Affected range stops below 0.38.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.38.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 0.85.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/bytecodealliance/wasmtime/commit/2ba4bce5cc719e5a74e571a534424614e62ecc41

References (2)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/bytecodealliance/wasmtime/commit/2ba4bce5cc719e5a74e571a534424614e62ecc41

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-7f6x-jwh5-m9r4

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-682

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card