CVE-2022-23639

Summary

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.

Affected Software

Weaknesses

• CWE-362: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-qc84-gqf4-9926
• https://github.com/crossbeam-rs/crossbeam/pull/781
• https://github.com/crossbeam-rs/crossbeam/releases/tag/crossbeam-utils-0.8.7

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-qc84-gqf4-9926
• https://github.com/crossbeam-rs/crossbeam/pull/781
• https://github.com/crossbeam-rs/crossbeam/releases/tag/crossbeam-utils-0.8.7

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