{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38003",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38003"
  ],
  "published": "2025-06-08T10:35:54Z",
  "summary": "can: bcm: add missing rcu read protection for procfs content",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add missing rcu read protection for procfs content\n\nWhen the procfs content is generated for a bcm_op which is in the process\nto be removed the procfs output might show unreliable data (UAF).\n\nAs the removal of bcm_op's is already implemented with rcu handling this\npatch adds the missing rcu_read_lock() and makes sure the list entries\nare properly removed under rcu protection.",
  "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-2025-38003"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/19f553a1ddf260da6570ed8f8d91a8c87f49b63a"
    },
    {
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      "url": "https://git.kernel.org/stable/c/659701c0b954ccdb4a916a4ad59bbc16e726d42c"
    },
    {
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      "url": "https://git.kernel.org/stable/c/0622846db728a5332b917c797c733e202c4620ae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6d7d458c41b98a5c1670cbd36f2923c37de51cf5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1f912f8484e9c4396378c39460bbea0af681f319"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/63567ecd99a24495208dc860d50fb17440043006"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7c9db92d5f0eadca30884af75c53d601edc512ee"
    },
    {
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      "url": "https://git.kernel.org/stable/c/dac5e6249159ac255dad9781793dbe5908ac9ddb"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires a local account to open a PF_CAN/CAN_BCM socket, issue RX_SETUP/RX_DELETE via sendmsg(), and read /proc/net/can-bcm/<inode>. No remote or adjacent network path reaches the racing procfs reader.\nAC:L - The attacker controls both sides of the race entirely \u2014 one thread loops reading the procfs entry while another loops RX_SETUP/RX_DELETE \u2014 and bcm_proc_show() held no lock whatsoever against the deleter, so the window is hit reliably by simple repetition; a working PoC was produced by the reporter for this bcm series.\nPR:L - can_create() performs no capability check, connect() with ifindex 0 needs no CAN device, and the created proc entry is mode 0644, so any unprivileged local user can drive the whole sequence in its own process (module autoload of can/can-bcm is also unprivileged).\nUI:N - The attacker performs every step itself \u2014 socket setup, op deletion, and reading its own procfs file \u2014 with no action by any other user.\nS:U - The freed object, the disclosure, and the crash are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Fields are read from a freed bcm_op and formatted directly into world-readable procfs output; since bcm_op lands in the sprayable kmalloc-512 cache, an attacker reclaiming it controls the list cursor and can steer the walk to arbitrary kernel addresses, leaking their contents to userspace.\nI:H - This is a use-after-free on an attacker-reclaimable slab object whose linkage pointers are dereferenced after free, a primitive that combined with heap grooming is leveraged for kernel state corruption and control-flow influence.\nA:H - A concurrent plain list_del() leaves LIST_POISON1 in the cursor, so the unprotected walker dereferences a non-canonical/freed pointer and oopses; the walk can also spin over reclaimed memory or hit a divide-by-zero on a re-read frames_abs, crashing or hanging the kernel."
    }
  }
}