{"id":"CVE-2026-89653","summary":"ceph: reject export_targets ranks \u003e= CEPH_MAX_MDS in mdsmap decode","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.","modified":"2026-09-13T03:46:44.815065022Z","published":"2026-09-11T19:45:43.261Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89653.json","cna_assigner":"Linux"},"references":[{"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/96c3f5fbb0d5386e7111426f047f98cec4586674"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730"},{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d517b3983dd3106ca92d6c5d0d09415a4a09481c"},{"fixed":"736adee11af36e407ed902264f8b2fb5cf94b62f"},{"fixed":"4d298880f82c42383b36946bafde7ccf4d804c9b"},{"fixed":"96c3f5fbb0d5386e7111426f047f98cec4586674"},{"fixed":"aedc9053d909508a5f56c3f49f885fc030df4730"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89653.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89653.json"}}],"schema_version":"1.9.0"}