Upstream information
Description
Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.SUSE information
Overall state of this security issue: Resolved
This issue is currently not rated by SUSE as it is not affecting the SUSE Enterprise products.
| CVSS detail | National Vulnerability Database | SUSE |
|---|---|---|
| Base Score | 5 | 2.5 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L |
| Attack Vector | Local | Local |
| Attack Complexity | Low | High |
| Privileges Required | Low | Low |
| User Interaction | Required | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | None | None |
| Availability Impact | High | Low |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 1 | 2 |
| Vector | CVSS:4.0/AV:P/AC:H/AT:P/PR:H/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| Attack Vector | Physical | Local |
| Attack Complexity | High | High |
| Attack Requirements | Present | Present |
| Privileges Required | High | Low |
| User Interaction | Active | None |
| Vulnerable System Confidentiality Impact | Low | None |
| Vulnerable System Integrity Impact | Low | None |
| Vulnerable System Availability Impact | Low | Low |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
SUSE Timeline for this CVE
CVE page created: Thu Apr 9 22:01:16 2026CVE page last modified: Wed Sep 9 13:55:32 2026