{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56603",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56603"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "net: af_can: do not leave a dangling sk pointer in can_create()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: af_can: do not leave a dangling sk pointer in can_create()\n\nOn error can_create() frees the allocated sk object, but sock_init_data()\nhas already attached it to the provided sock object. This will leave a\ndangling sk pointer in the sock object and may cause use-after-free later.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56603"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/884ae8bcee749be43a071d6ed2d89058dbd2425c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce39b5576785bb3e66591145aad03d66bc3e778d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1fe625f12d090d69f3f084990c7e4c1ff94bfe5f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5947c9ac08f0771ea8ed64186b0d52e9029cb6c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db207d19adbac96058685f6257720906ad41d215"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8df832e6b945e1ba61467d7f1c9305e314ae92fe"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/811a7ca7320c062e15d0f5b171fe6ad8592d1434"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The defect lives in the `socket(AF_CAN, SOCK_RAW, CAN_RAW)` creation path, reached only through a local syscall via `__sock_create()`; no CAN-bus frame or network data reaches `can_create()`. Consistent with the Bluetooth and af_packet siblings in the same series, which were also scored AV:L because the flaw is in socket setup rather than frame processing.\nAC:L - The only failing `->init` is `raw_init()`'s `alloc_percpu(struct uniqframe)` returning `-ENOMEM`, and an unprivileged local attacker can drive the percpu allocator into failure by spraying percpu-consuming objects (including CAN raw sockets themselves) before retrying `socket()` in a tight loop. This is the same attacker-induced-ENOMEM shape as the af_packet sibling CVE-2024-56606, which was scored AC:L.\nPR:L - `can_create()` performs no `capable()` check at all \u2014 unlike af_packet there is no `CAP_NET_RAW` gate \u2014 and there is no `net_eq(net, &init_net)` restriction, so any unprivileged local user, including inside an unprivileged user namespace, can reach it. Where `CONFIG_CAN` is modular, `MODULE_ALIAS_NETPROTO(PF_CAN)` lets the unprivileged `socket()` call autoload the module itself.\nUI:N - The attacker performs the entire sequence \u2014 memory pressure plus repeated `socket()` calls \u2014 from its own process. No victim action, mount, or file open is involved.\nS:U - The freed `struct raw_sock`/`struct sock` and the stale `sock->sk` reference both live entirely within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Per the use-after-free rubric, the stale `sock->sk` pointing at a freed `raw_sock` in the general kmalloc caches lets an attacker reclaim the slab and read back attacker-shaped or leftover kernel data; the demonstrated consumer for this exact bug class (CVE-2024-40954) is a KASAN-confirmed slab-use-after-free *read* of the freed sock via `__sock_gen_cookie()`.\nI:H - The same dangling reference permits heap spraying of the reclaimed slot, giving control over function-pointer-bearing fields of `struct sock` (`sk_prot`, `sk_destruct`, `sk_wq`) and therefore a control-flow-hijack primitive rather than mere data corruption.\nA:H - Any dereference of the freed `sock->sk` before `iput()` faults or corrupts kernel state, producing an oops or panic; the rubric treats all use-after-free conditions as high availability impact even when only partially exploited."
    }
  }
}