GHSA-3Q37-WMQ7-MF4X

Vulnerability from github – Published: 2025-12-24 12:30 – Updated: 2025-12-24 12:30
VLAI?
Details

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

can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access

In the j1939_tp_tx_dat_new() function, an out-of-bounds memory access could occur during the memcpy() operation if the size of skb->cb is larger than the size of struct j1939_sk_buff_cb. This is because the memcpy() operation uses the size of skb->cb, leading to a read beyond the struct j1939_sk_buff_cb.

Updated the memcpy() operation to use the size of struct j1939_sk_buff_cb instead of the size of skb->cb. This ensures that the memcpy() operation only reads the memory within the bounds of struct j1939_sk_buff_cb, preventing out-of-bounds memory access.

Additionally, add a BUILD_BUG_ON() to check that the size of skb->cb is greater than or equal to the size of struct j1939_sk_buff_cb. This ensures that the skb->cb buffer is large enough to hold the j1939_sk_buff_cb structure.

[mkl: rephrase commit message]

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{
  "affected": [],
  "aliases": [
    "CVE-2023-54039"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T11:15:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access\n\nIn the j1939_tp_tx_dat_new() function, an out-of-bounds memory access\ncould occur during the memcpy() operation if the size of skb-\u003ecb is\nlarger than the size of struct j1939_sk_buff_cb. This is because the\nmemcpy() operation uses the size of skb-\u003ecb, leading to a read beyond\nthe struct j1939_sk_buff_cb.\n\nUpdated the memcpy() operation to use the size of struct\nj1939_sk_buff_cb instead of the size of skb-\u003ecb. This ensures that the\nmemcpy() operation only reads the memory within the bounds of struct\nj1939_sk_buff_cb, preventing out-of-bounds memory access.\n\nAdditionally, add a BUILD_BUG_ON() to check that the size of skb-\u003ecb\nis greater than or equal to the size of struct j1939_sk_buff_cb. This\nensures that the skb-\u003ecb buffer is large enough to hold the\nj1939_sk_buff_cb structure.\n\n[mkl: rephrase commit message]",
  "id": "GHSA-3q37-wmq7-mf4x",
  "modified": "2025-12-24T12:30:29Z",
  "published": "2025-12-24T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-54039"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36befc9aed6202b4a9b906529aea13eacd7e34ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c3fb22a6ec68258ee129a2e6b720f43dffc562f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fe1d9b6231a68ffc91318f57fd8e4982f028cf7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70caa596d158a5d84b117f722d58f3ea503a5ba9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b45193cb4df556fe6251b285a5ce44046dd36b4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2136f05690c272dfc9f9d6efcc51d5f53494b33"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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