libceph: handle rbtree insertion error in decode_choose_args()

{
  "id": "8101f9a8fe3b39af436d7a8aa738459a0b9b2178db35ecb1a1caa0d5756a88e8",
  "url": "https://osv.dev/vulnerability/CVE-2026-52954",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libceph: handle rbtree insertion error in decode_choose_args()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]",
    "evidence": "osv:CVE-2026-52954",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.258",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.209",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.175",
            "evidence": "/affected/1/ranges"
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            "value": "6.6.141",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-52954",
      "aliases": [
        "CVE-2026-52954"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "c7bf7864e2924fa5508ac270b0e9364bc13d5a6c"
                },
                {
                  "fixed": "f47430fc1f815e87406e2d3b4e476eff1bc7fd9b"
                },
                {
                  "fixed": "0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da"
                },
                {
                  "fixed": "534ebc08df97c47d4c7596f336fa31ecbf91519c"
                },
                {
                  "fixed": "80c73bd1b2b04355d1d0c29be8ccbd25a380905d"
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                {
                  "fixed": "4d2b37abda9536808655830d683dc491d31741a8"
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                {
                  "fixed": "0a1265a9ab875f92b6a3ffb497404f46cf9d76a3"
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                  "fixed": "d289478cfc0bcf81c7914200d6abdcb78bd04ded"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52954.json"
          }
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "4.13.0"
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                {
                  "fixed": "5.10.258"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
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                  "introduced": "5.16.0"
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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-2026-52954.json"
          }
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      ],
      "modified": "2026-10-28T02:30:40.994712319Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3",
        "https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da",
        "https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8",
        "https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c",
        "https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d",
        "https://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c",
        "https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded",
        "https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52954.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52954",
        "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/2026/52xxx/CVE-2026-52954.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52954",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508740,
  "published_at": "2026-06-24T16:28:36.992+00:00"
}