{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-54039",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-54039"
  ],
  "published": "2025-12-24T10:57:20Z",
  "summary": "can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access",
  "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->cb is\nlarger than the size of struct j1939_sk_buff_cb. This is because the\nmemcpy() operation uses the size of skb->cb, 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->cb. 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->cb\nis greater than or equal to the size of struct j1939_sk_buff_cb. This\nensures that the skb->cb buffer is large enough to hold the\nj1939_sk_buff_cb structure.\n\n[mkl: rephrase commit message]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.24"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-54039"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d2136f05690c272dfc9f9d6efcc51d5f53494b33"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/70caa596d158a5d84b117f722d58f3ea503a5ba9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4fe1d9b6231a68ffc91318f57fd8e4982f028cf7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c3fb22a6ec68258ee129a2e6b720f43dffc562f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36befc9aed6202b4a9b906529aea13eacd7e34ff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b45193cb4df556fe6251b285a5ce44046dd36b4a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}