{"id":"CVE-2026-89653","revision":"aa5756e84b194e3b8cf200f0dbf7dd1b","records":[{"revision":"aa5756e84b194e3b8cf200f0dbf7dd1b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89653","aliases":[],"title":"ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: reject export_targets ranks >= 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.","state":0,"publishedAt":"2026-09-11T19:45:43.261+00:00","modifiedAt":"2026-10-19T08:50:24.862+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ceph/mdsmap.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"8c823bbab3c24e657469a84db96902ba82d4e8bb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"c4addccd05bacbef2144b4db14853d0308a218ac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"736adee11af36e407ed902264f8b2fb5cf94b62f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"4d298880f82c42383b36946bafde7ccf4d804c9b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"96c3f5fbb0d5386e7111426f047f98cec4586674\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d517b3983dd3106ca92d6c5d0d09415a4a09481c\",\n                            \"lessThan\": \"aedc9053d909508a5f56c3f49f885fc030df4730\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ceph/mdsmap.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe","https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb","https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac","https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f","https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b","https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674","https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89653","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89653","identifiers":["CVE-2026-89653"]},"retained":false,"historicalAffected":[]}],"coverage":[]}