rustsec-2024-0347
Vulnerability from osv_rustsec
Published
2024-07-01 12:00
Modified
2025-10-28 06:02
Summary
Incorrect usage of `#[repr(packed)]`
Details

The affected versions make unsafe memory accesses under the assumption that #[repr(packed)] has a guaranteed field order.

The Rust specification does not guarantee this, and https://github.com/rust-lang/rust/pull/125360 (1.80.0-beta) starts reordering fields of #[repr(packed)] structs, leading to illegal memory accesses.

The patched versions 0.9.7 and 0.10.4 use #[repr(C, packed)], which guarantees field order.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "zerovec",
        "purl": "pkg:cargo/zerovec"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.9.7"
            },
            {
              "introduced": "0.10.0"
            },
            {
              "fixed": "0.10.4"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-xrv3-jmcp-374j"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The affected versions make unsafe memory accesses under the assumption that `#[repr(packed)]` has a guaranteed field order. \n\nThe Rust specification does not guarantee this, and https://github.com/rust-lang/rust/pull/125360 (1.80.0-beta) starts \nreordering fields of `#[repr(packed)]` structs, leading to illegal memory accesses.\n\nThe patched versions `0.9.7` and `0.10.4` use `#[repr(C, packed)]`, which guarantees field order.",
  "id": "RUSTSEC-2024-0347",
  "modified": "2025-10-28T06:02:18Z",
  "published": "2024-07-01T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/zerovec"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2024-0347.html"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Incorrect usage of `#[repr(packed)]`"
}


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