rpmsg: char: Avoid double destroy of default endpoint

{
  "id": "094008d194ff1181b20da03606637bf4344c55c50c7f6f29920c361ece4e0fc3",
  "url": "https://osv.dev/vulnerability/CVE-2022-50421",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rpmsg: char: Avoid double destroy of default endpoint",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: rpmsg: char: Avoid double destroy of default endpoint The rpmsg_dev_remove() in rpmsg_core is the place for releasing this default endpoint. So need to avoid destroying the default endpoint in rpmsg_chrdev_eptdev_destroy(), this should be the same as rpmsg_eptdev_release(). Otherwise there will be double destroy issue that ept->refcount report warning: refcount_t: underflow; use-after-free. Call trace: refcount_warn_saturate+0xf8/0x150 virtio_rpmsg_destroy_ept+0xd4/0xec rpmsg_dev_remove+0x60/0x70 The issue can be reproduced by stopping remoteproc before closing the /dev/rpmsgX.",
    "evidence": "osv:CVE-2022-50421",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.19.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.3",
            "evidence": "/affected/1/ranges"
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        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-50421",
      "aliases": [
        "CVE-2022-50421"
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      "metrics": [
        {
          "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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                {
                  "fixed": "3f20ef7a845c2c8d7ec82ecffa20d95cab5ecfeb"
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        {
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.18.0"
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                {
                  "fixed": "5.19.17"
                }
              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.20.0"
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                {
                  "fixed": "6.0.3"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50421.json"
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      ],
      "modified": "2026-10-28T02:30:49.062833405Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3f20ef7a845c2c8d7ec82ecffa20d95cab5ecfeb",
        "https://git.kernel.org/stable/c/467233a4ac29b215d492843d067a9f091e6bf0c5",
        "https://git.kernel.org/stable/c/ef828a39d6a7028836eaf37df3ad568c8c2dd6f9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50421.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50421",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50421.json"
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    "related_cves": [
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        "value": "CVE-2022-50421",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 517261,
  "published_at": "2025-10-01T11:41:54.351+00:00"
}