atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().

{
  "id": "849f0b39e3dec91986dc0522492ef35c167afdcdb74035a7d6cb27398d6ba639",
  "url": "https://osv.dev/vulnerability/CVE-2025-38245",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister(). syzbot reported a warning below during atm_dev_register(). [0] Before creating a new device and procfs/sysfs for it, atm_dev_register() looks up a duplicated device by __atm_dev_lookup(). These operations are done under atm_dev_mutex. However, when removing a device in atm_dev_deregister(), it releases the mutex just after removing the device from the list that __atm_dev_lookup() iterates over. So, there will be a small race window where the device does not exist on the device list but procfs/sysfs are still not removed, triggering the splat. Let's hold the mutex until procfs/sysfs are removed in atm_dev_deregister(). [0]: proc_dir_entry 'atm/atmtcp:0' already registered WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377 Modules linked in: CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377 Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48 RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: fff",
    "evidence": "osv:CVE-2025-38245",
    "products": [
      {
        "name": {
          "value": "Kernel",
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "modified": "2026-10-28T02:30:33.223231942Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/26248d5d68c865b888d632162abbf8130645622c",
        "https://git.kernel.org/stable/c/2a8dcee649d12f69713f2589171a1caf6d4fa439",
        "https://git.kernel.org/stable/c/4bb1bb438134d9ee6b97cc07289dd7c569092eec",
        "https://git.kernel.org/stable/c/6922f1a048c090f10704bbef4a3a1e81932d2e0a",
        "https://git.kernel.org/stable/c/a433791aeaea6e84df709e0b9584b9bbe040cd1c",
        "https://git.kernel.org/stable/c/ae539d963a17443ec54cba8a767e4ffa318264f4",
        "https://git.kernel.org/stable/c/b2e40fcfe1575faaa548f87614006d3fe44c779e",
        "https://git.kernel.org/stable/c/cabed6ba92a9a8c09da02a3f20e32ecd80989896",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38245.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38245",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "value": "CVE-2025-38245",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 500274,
  "published_at": "2025-07-09T10:42:27.263+00:00"
}