RUSTSEC-2022-0041 (GHSA-QC84-GQF4-9926)

Vulnerability from osv_rustsec – Published: 2022-02-05 12:00 – Updated: 2026-07-17 15:52 – Source website
VLAI
Summary
Unsoundness of AtomicCell<*64> arithmetics on 32-bit targets that support Atomic*64
Details

Impact

Affected versions of this crate 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 the following problems:

  • Unaligned memory accesses
  • 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.

32-bit targets with Atomic{I,U}64 and {i,u}64 have the same alignment are also not affected by this issue.

The following is a complete list of the builtin targets that may be affected. (last update: nightly-2022-02-11)

  • armv7-apple-ios (tier 3)
  • armv7s-apple-ios (tier 3)
  • i386-apple-ios (tier 3)
  • i586-unknown-linux-gnu
  • i586-unknown-linux-musl
  • i686-apple-darwin (tier 3)
  • i686-linux-android
  • i686-unknown-freebsd
  • i686-unknown-haiku (tier 3)
  • i686-unknown-linux-gnu
  • i686-unknown-linux-musl
  • i686-unknown-netbsd (tier 3)
  • i686-unknown-openbsd (tier 3)
  • i686-wrs-vxworks (tier 3)

(script to get list)

Patches

This has been fixed in crossbeam-utils 0.8.7.

Affected 0.8.x releases have been yanked.

Thanks to @taiki-e.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "crossbeam-utils",
        "purl": "pkg:cargo/crossbeam-utils"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.8.7"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-qc84-gqf4-9926",
    "CVE-2022-23639"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "## Impact\n\nAffected versions of this crate incorrectly assumed that the alignment of {i,u}64 was always the same as Atomic{I,U}64.\n\nHowever, the alignment of {i,u}64 on a 32-bit target can be smaller than Atomic{I,U}64.\n\nThis can cause the following problems:\n\n- Unaligned memory accesses\n- Data race\n\nCrates using fetch_* methods with AtomicCell\u003c{i,u}64\u003e are affected by this issue.\n\n32-bit targets without Atomic{I,U}64 and 64-bit targets are not affected by this issue.\n\n32-bit targets with Atomic{I,U}64 and {i,u}64 have the same alignment are also not affected by this issue.\n\nThe following is a complete list of the builtin targets that may be affected. (last update: nightly-2022-02-11)\n\n- armv7-apple-ios (tier 3)\n- armv7s-apple-ios (tier 3)\n- i386-apple-ios (tier 3)\n- i586-unknown-linux-gnu\n- i586-unknown-linux-musl\n- i686-apple-darwin (tier 3)\n- i686-linux-android\n- i686-unknown-freebsd\n- i686-unknown-haiku (tier 3)\n- i686-unknown-linux-gnu\n- i686-unknown-linux-musl\n- i686-unknown-netbsd (tier 3)\n- i686-unknown-openbsd (tier 3)\n- i686-wrs-vxworks (tier 3)\n\n([script to get list](https://gist.github.com/taiki-e/3c7891e8c5f5e0cbcb44d7396aabfe10))\n\n## Patches\n\nThis has been fixed in crossbeam-utils 0.8.7.\n\nAffected 0.8.x releases have been yanked.\n\nThanks to [@taiki-e](https://github.com/taiki-e).",
  "id": "RUSTSEC-2022-0041",
  "modified": "2026-07-17T15:52:38Z",
  "published": "2022-02-05T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/crossbeam-utils"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2022-0041.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/crossbeam-rs/crossbeam/pull/781"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Unsoundness of AtomicCell\u003c*64\u003e arithmetics on 32-bit targets that support Atomic*64"
}



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