{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cd1a677cad994021b19665ed476aea63f5d54f31"
            },
            {
              "fixed": "279c0852999fd2384f4a88155091a99e81f96873"
            },
            {
              "fixed": "6cf666e47f2b51d5a887ec8a3226cde951757d27"
            },
            {
              "fixed": "3b2e62a7655d347a845a91155610ddae11daffc6"
            },
            {
              "fixed": "c1b937ff24b19e69aa7fb1b0f46a74d4c9668692"
            },
            {
              "fixed": "6d1c6f228854aa89844fd0152d7ed7ac72a55e89"
            },
            {
              "fixed": "c77633a9595658210a6e216a071e5a396a0835a7"
            },
            {
              "fixed": "f374967fcdf04001c9b66df1c19106fa83cd91f7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90067.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: validate banner payload length\n\nWhen parsing the Ceph messenger v2 protocol banner, the `payload_len` field\nis decoded from the banner prefix. If a client sends a banner with a\n`payload_len` of 0, the kernel sets up a 0-length socket read. This\nviolates an invariant in the state machine, triggering a warning in\n`populate_in_iter()`:\n\n------------[ cut here ]------------\n!iov_iter_count(\u0026con-\u003ev2.in_iter)\nWARNING: net/ceph/messenger_v2.c:3129 at populate_in_iter\nnet/ceph/messenger_v2.c:3129 [inline], CPU#1: kworker/1:3/5070\nWARNING: net/ceph/messenger_v2.c:3129 at ceph_con_v2_try_read+0x6634/0x6810\nnet/ceph/messenger_v2.c:3159, CPU#1: kworker/1:3/5070\n...\nCall Trace:\n \u003cTASK\u003e\n ceph_con_workfn+0x1f5/0x14a0 net/ceph/messenger.c:1575\n process_one_work kernel/workqueue.c:3322 [inline]\n process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405\n worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAccording to the msgr2 protocol specification, the banner payload is\nexpected to contain at least two 64-bit integers (`server_feat` and\n`server_req_feat`). Therefore, `payload_len` must be at least 16 bytes.\n\nFix this by adding a check in `process_banner_prefix()` to reject a\n`payload_len` smaller than 16 bytes. This prevents the 0-length read and\ncorrectly aborts the connection with a protocol error.",
  "id": "CVE-2026-90067",
  "modified": "2026-09-19T03:30:59.300007238Z",
  "published": "2026-09-17T16:05:49.600Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/279c0852999fd2384f4a88155091a99e81f96873"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b2e62a7655d347a845a91155610ddae11daffc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cf666e47f2b51d5a887ec8a3226cde951757d27"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d1c6f228854aa89844fd0152d7ed7ac72a55e89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1b937ff24b19e69aa7fb1b0f46a74d4c9668692"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c77633a9595658210a6e216a071e5a396a0835a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f374967fcdf04001c9b66df1c19106fa83cd91f7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90067.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90067"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libceph: validate banner payload length"
}