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TI-2022-07691 Aliases CVE-2022-23639GHSA-qc84-gqf4-9926

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

Priority HIGH 70CWE-362Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01229 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed crossbeam (crossbeam-rs): 0.8.7crossbeam-utils (crates.io): 0.8.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
crossbeam-rscrossbeambefore 0.8.70.8.7Patch availableCNA
—crossbeam-utils (crates.io)before 0.8.70.8.7Patch availableGHSA-qc84-gqf4-9926
  • crossbeam Vendorcrossbeam-rs Affected before 0.8.7 Fixed in 0.8.7 Patch available CNA
  • crossbeam-utils (crates.io) Vendor— Affected before 0.8.7 Fixed in 0.8.7 Patch available GHSA-qc84-gqf4-9926

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:crossbeam_project:crossbeam:*:*:*:*:*:rust:*:*before 0.8.7Vulnerablecrossbeam-rs
  • cpe:2.3:a:crossbeam_project:crossbeam:*:*:*:*:*:rust:*:* Versions before 0.8.7 Vulnerable ·crossbeam-rs

Remediation

  • Fix · CNA crossbeam (crossbeam-rs) Fixed in 0.8.7
  • Fix · GHSA-qc84-gqf4-9926 crossbeam-utils (crates.io) Fixed in 0.8.7 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-23639
  2. 2026-10-03 Alias added: GHSA-qc84-gqf4-9926

References

Exploit 1

Patch 2

Advisory 1

Other 2

  • TI-2020-12026 Undefined Behavior in bounded Crossbeam channel CVSS 3.1CRITICAL 9.8
  • TI-2021-12475 Data race in crossbeam-deque CVSS 3.1CRITICAL 9.8
  • TI-2018-14958 An issue was discovered in the crossbeam crate before 0.4.1 for Rust. CVSS 3.0CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences