{"api_version":"1","generated_at":"2026-09-12T18:14:19+00:00","cve":"CVE-2026-89653","urls":{"html":"https://cve.report/CVE-2026-89653","api":"https://cve.report/api/cve/CVE-2026-89653.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89653","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89653"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:51","updated_at":"2026-09-11 20:19:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674","name":"https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730","name":"https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f","name":"https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b","name":"https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89653","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89653","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 736adee11af36e407ed902264f8b2fb5cf94b62f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 4d298880f82c42383b36946bafde7ccf4d804c9b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 96c3f5fbb0d5386e7111426f047f98cec4586674 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d517b3983dd3106ca92d6c5d0d09415a4a09481c aedc9053d909508a5f56c3f49f885fc030df4730 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ceph/mdsmap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"736adee11af36e407ed902264f8b2fb5cf94b62f","status":"affected","version":"d517b3983dd3106ca92d6c5d0d09415a4a09481c","versionType":"git"},{"lessThan":"4d298880f82c42383b36946bafde7ccf4d804c9b","status":"affected","version":"d517b3983dd3106ca92d6c5d0d09415a4a09481c","versionType":"git"},{"lessThan":"96c3f5fbb0d5386e7111426f047f98cec4586674","status":"affected","version":"d517b3983dd3106ca92d6c5d0d09415a4a09481c","versionType":"git"},{"lessThan":"aedc9053d909508a5f56c3f49f885fc030df4730","status":"affected","version":"d517b3983dd3106ca92d6c5d0d09415a4a09481c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ceph/mdsmap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:45:43.261Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f"},{"url":"https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b"},{"url":"https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674"},{"url":"https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730"}],"title":"ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89653","datePublished":"2026-09-11T19:45:43.261Z","dateReserved":"2026-09-11T19:38:34.742Z","dateUpdated":"2026-09-11T19:45:43.261Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:51","lastModifiedDate":"2026-09-11 20:19:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89653","Ordinal":"1","Title":"ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap deco","CVE":"CVE-2026-89653","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89653","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap deco"}]}}}