ghsa-78xp-xvw2-6rw6
Vulnerability from github
Published
2025-04-17 18:31
Modified
2025-04-17 21:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

can: dev: can_restart: fix use after free bug

After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netif_rx_ni() in: stats->rx_bytes += cf->len;

Reordering the lines solves the issue.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47668"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-17T18:15:43Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: dev: can_restart: fix use after free bug\n\nAfter calling netif_rx_ni(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is accessed\nafter the netif_rx_ni() in:\n      stats-\u003erx_bytes += cf-\u003elen;\n\nReordering the lines solves the issue.",
  "id": "GHSA-78xp-xvw2-6rw6",
  "modified": "2025-04-17T21:31:03Z",
  "published": "2025-04-17T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47668"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03f16c5075b22c8902d2af739969e878b0879c94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08ab951787098ae0b6c0364aeea7a8138226f234"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/260925a0b7d2da5449f8ecfd02c1405e0c8a45b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/593c072b7b3c4d7044416eb039d9ad706bedd67a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92668d28c7e6a7a2ba07df287669ffcdf650c421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac48ef15826e83f4206c47add61072e8fc76d328"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbc6847b9b8978b520f62fbc7c68c54ef0f8d282"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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