CVE-2022-23639

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CVE-2022-23639

Summary: Improper Restriction of Operations within the Bounds of a Memory Buffer and Race Condition in crossbeam-utils

Details: crossbeam-utils provides atomics, synchronization primitives, scoped threads, and other utilities for concurrent programming in Rust. crossbeam-utils prior to version 0.8.7 incorrectly assumed that the alignment of `{i,u}64` was always the same as `Atomic{I,U}64`. However, the alignment of `{i,u}64` on a 32-bit target can be smaller than `Atomic{I,U}64`. This can cause unaligned memory accesses and data race. Crates using `fetch_*` methods with `AtomicCell<{i,u}64>` are affected by this issue. 32-bit targets without `Atomic{I,U}64` and 64-bit targets are not affected by this issue. This has been fixed in crossbeam-utils 0.8.7. There are currently no known workarounds.

References: https://github.com/crossbeam-rs/crossbeam/releases/tag/crossbeam-utils-0.8.7, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/23xxx/CVE-2022-23639.json, https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-qc84-gqf4-9926, https://nvd.nist.gov/vuln/detail/CVE-2022-23639, https://github.com/crossbeam-rs/crossbeam/pull/781