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Fencer Vulns
high 8.1

CVE-2022-23639 json

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

published 2022-02-05 4 y ago modified 2026-07-17 3 mo ago also GHSA-qc84-gqf4-9926 , RUSTSEC-2022-0041 , EUVD-2022-1149

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

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.

Patch / fix

  • crates.io crossbeam-utils 0.8.7
  • crossbeam_project crossbeam 0.8.7
  • rust-crossbeam-utils Debian 14, Debian 13, Debian 12 0.8.8-1

debian advisories DEBIAN-CVE-2022-23639

  • rustc Ubuntu 20.04 LTS 1.59.0+dfsg1~ubuntu1~llvm-1~ubuntu1~20.04.2
  • rustc Ubuntu 22.04 LTS 1.58.1+dfsg1~ubuntu1-0ubuntu1
  • firefox Ubuntu 22.04 LTS 1:1snap1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2022-23639

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • librsvg2 Azure Linux 3.0 2.58.1-1
  • rust Azure Linux 3.0 crossbeam_utils-0.8.7

azure linux advisories AZL-41454AZL-61381

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-23639 updated cvss 6.2

rust-crossbeam: unaligned memory accesses and data races could lead to denial of service for 32-bit targets only

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-qc84-gqf4-9926 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
crates.io crossbeam-utils
<0.8.7
>=0.0.0-0, <0.8.7
0.8.7

Affected products

  • crossbeam-rs crossbeam

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.