Rust advisories / sys-info
Vulnerability CriticalRUSTSEC-2020-0100 · sys-info
RUSTSEC-2020-0100: Double free when calling `sys_info::disk_info` from multiple threads
Short answerA security vulnerability in the sys-info crate: Double free when calling `sys_info::disk_info` from multiple threads. Critical severity (CVSS 9.8). Fixed in 0.8.0: update to a fixed version.
| Crate | sys-info |
|---|---|
| Type | Vulnerability (memory-corruption) |
| Affected versions | Before 0.8.0. |
| Fixed in | 0.8.0 |
| Severity | Critical, CVSS 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Published | 2020-05-31 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2020-36434, GHSA-2f5j-3mhq-xv58 |
| Affected functions | sys_info::disk_info |
What to do
- See which version you have:
cargo tree -i sys-info(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p sys-info. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplesys-info = "0.8.0") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
Affected versions of sys-info use a static, global, list to store temporary disk information while running. The function that cleans up this list, DFCleanup, assumes a single threaded environment and will try to free the same memory twice in a multithreaded environment.
This results in consistent double-frees and segfaults when calling sys_info::disk_info from multiple threads at once.
The issue was fixed by moving the global variable into a local scope.
Safer Alternatives:
References
- Package: crates.io/crates/sys-info
- Advisory: rustsec.org/advisories/RUSTSEC-2020-0100.html
- Report: github.com/FillZpp/sys-info-rs/issues/63
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Up next
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