CVE-2022-23639

Name: CVE-2022-23639
Creator: NVD / NIST
Published: 2022-02-15T19:15:08.34+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.21%

Last modified Jun 17, 2026

CVE-2022-23639 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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`. EPSS estimates a 1.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.21%

64.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-362

Affected Software

Vendor	Product	Versions
Crossbeam Project	Crossbeam	< 0.8.7

References

https://github.com/crossbeam-rs/crossbeam/pull/781Issue Tracking, Patch, Third Party Advisory
https://github.com/crossbeam-rs/crossbeam/releases/tag/crossbeam-utils-0.8.7Patch, Third Party Advisory
https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-qc84-gqf4-9926Exploit, Third Party Advisory
https://github.com/crossbeam-rs/crossbeam/pull/781Issue Tracking, Patch, Third Party Advisory
https://github.com/crossbeam-rs/crossbeam/releases/tag/crossbeam-utils-0.8.7Patch, Third Party Advisory
https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-qc84-gqf4-9926Exploit, Third Party Advisory

Timeline

Published: Feb 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-23639?

How severe is CVE-2022-23639?

CVE-2022-23639 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.

How do I fix CVE-2022-23639?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-23639?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST