Security readout for executives and security teams
Plain-English summary
This is a correctness flaw in Wasmtime's Cranelift compiler on AArch64 systems. Under certain WebAssembly division operations using constant divisors, guest programs can calculate wrong results. Sources describe impact to WebAssembly guest behavior, not host compromise. Organizations using affected Wasmtime or Cranelift versions on ARM64 should upgrade affected runtime paths.
Executive priority
Handle as a targeted moderate integrity risk, not a broad emergency. Upgrade any AArch64 Wasmtime or Cranelift deployments where WebAssembly output affects security, financial, operational, or customer-facing decisions. Lower priority is reasonable for environments not using AArch64 or not using these components.
Technical view
Cranelift's AArch64 lowering for constant divisors mishandled sign or zero extension, placing an incorrect constant into a register during division. Affected versions are Wasmtime before 0.38.2 and cranelift-codegen before 0.85.2. The flaw is CWE-682 with CVSS 5.9, integrity impact high, and attack complexity high.
Likely exposure
Exposure is limited to deployments executing WebAssembly with Wasmtime or Cranelift on AArch64. Other platforms are not affected according to the source bundle. Risk is most relevant where guest WebAssembly correctness affects decisions, calculations, policy checks, or customer-visible output.
Exploitation context
The source bundle does not show active exploitation, and the CVE is not marked KEV. The issue can cause incorrect guest execution results, but sources do not describe a sandbox escape or host compromise. Exploitability is described indirectly by CVSS as network reachable but high complexity.
Researcher notes
The key question is whether untrusted or semi-trusted WebAssembly runs through affected Cranelift AArch64 code generation. The advisory frames impact as guest program misbehavior relative to the WebAssembly specification, with no expected host impact. Evidence for exploitation or workaround guidance is absent in the provided sources.
Mitigation direction
- Upgrade Wasmtime to version 0.38.2 or later.
- Upgrade cranelift-codegen to version 0.85.2 or later.
- Prioritize AArch64 runtime environments before non-AArch64 systems.
- Check Bytecode Alliance advisory for any updated vendor guidance.
- Treat no-workaround status as an upgrade requirement.
Validation and detection
- Inventory Wasmtime and cranelift-codegen versions in production and build systems.
- Identify whether affected services run on AArch64 hosts.
- Confirm upgraded dependencies resolve to Wasmtime 0.38.2 or cranelift-codegen 0.85.2 or later.
- Run application regression tests covering WebAssembly division and policy-sensitive calculations.
- Document non-AArch64 deployments as not affected by this CVE.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-682: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-31169 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-7f6x-jwh5-m9r4CVE reference · x_refsource_CONFIRM
- https://github.com/bytecodealliance/wasmtime/commit/2ba4bce5cc719e5a74e571a534424614e62ecc41CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Calculation
Incorrect Calculation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.