libceph: validate banner payload length

{
  "id": "7e2c8a9d42c55d992fa25900f5ee3261cb918d668e0e54079622457988fb34a6",
  "url": "https://osv.dev/vulnerability/CVE-2026-90067",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libceph: validate banner payload length",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: libceph: validate banner payload length When parsing the Ceph messenger v2 protocol banner, the `payload_len` field is decoded from the banner prefix. If a client sends a banner with a `payload_len` of 0, the kernel sets up a 0-length socket read. This violates an invariant in the state machine, triggering a warning in `populate_in_iter()`: ------------[ cut here ]------------ !iov_iter_count(&con->v2.in_iter) WARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter net/ceph/messenger_v2.c:3129 [inline], CPU#1: kworker/1:3/5070 WARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810 net/ceph/messenger_v2.c:3159, CPU#1: kworker/1:3/5070 ... Call Trace: ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 According to the msgr2 protocol specification, the banner payload is expected to contain at least two 64-bit integers (`server_feat` and `server_req_feat`). Therefore, `payload_len` must be at least 16 bytes. Fix this by adding a check in `process_banner_prefix()` to reject a `payload_len` smaller than 16 bytes. This prevents the 0-length read and correctly aborts the connectio",
    "evidence": "osv:CVE-2026-90067",
    "products": [
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          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-90067",
      "aliases": [
        "CVE-2026-90067"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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      ],
      "modified": "2026-10-28T02:30:52.137090235Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/279c0852999fd2384f4a88155091a99e81f96873",
        "https://git.kernel.org/stable/c/3b2e62a7655d347a845a91155610ddae11daffc6",
        "https://git.kernel.org/stable/c/6cf666e47f2b51d5a887ec8a3226cde951757d27",
        "https://git.kernel.org/stable/c/6d1c6f228854aa89844fd0152d7ed7ac72a55e89",
        "https://git.kernel.org/stable/c/c1b937ff24b19e69aa7fb1b0f46a74d4c9668692",
        "https://git.kernel.org/stable/c/c77633a9595658210a6e216a071e5a396a0835a7",
        "https://git.kernel.org/stable/c/f374967fcdf04001c9b66df1c19106fa83cd91f7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90067.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90067",
        "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/2026/90xxx/CVE-2026-90067.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2026-90067",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520963,
  "published_at": "2026-09-17T16:05:49.6+00:00"
}