conquer-once's OnceCell lacks Send bound for its Sync trait.
Affected versions of `conquer-once` implements `Sync` for its `OnceCell` type without restricting it to `Send`able types. This allows non-`Send` but `Sync` types such as `MutexGuard` to be sent across threads leading to undefined behavior and memory corruption in concurrent programs. The issue was fixed by adding a `Send` constraint to `OnceCell`.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2020-36208US | high7.8 | — | ||
An issue was discovered in the conquer-once crate before 0.3.2 for Rust. Thread crossing can occur for a non-Send but Sync type, leading to memory corruption. | ||||
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references
External citations — patches, advisories, analysis.
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