{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d517b3983dd3106ca92d6c5d0d09415a4a09481c"
            },
            {
              "fixed": "3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe"
            },
            {
              "fixed": "8c823bbab3c24e657469a84db96902ba82d4e8bb"
            },
            {
              "fixed": "c4addccd05bacbef2144b4db14853d0308a218ac"
            },
            {
              "fixed": "736adee11af36e407ed902264f8b2fb5cf94b62f"
            },
            {
              "fixed": "4d298880f82c42383b36946bafde7ccf4d804c9b"
            },
            {
              "fixed": "96c3f5fbb0d5386e7111426f047f98cec4586674"
            },
            {
              "fixed": "aedc9053d909508a5f56c3f49f885fc030df4730"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "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": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89653.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: reject export_targets ranks \u003e= CEPH_MAX_MDS in mdsmap decode\n\nMDSMap export_targets entries are monitor controlled. check_new_map()\nuses each entry as a bit number in a fixed stack bitmap, so a rank\noutside the protocol namespace can make set_bit() write past the end of\nthe array.\n\nReject ranks outside CEPH_MAX_MDS while decoding the map. Do not\nvalidate against possible_max_rank here because maps may legitimately\nreference ranks beyond a temporarily reduced max_mds.",
  "id": "CVE-2026-89653",
  "modified": "2026-09-15T03:30:55.746953076Z",
  "published": "2026-09-11T19:45:43.261Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89653.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89653"
    },
    {
      "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:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ceph: reject export_targets ranks \u003e= CEPH_MAX_MDS in mdsmap decode"
}