{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89653", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.742Z", "datePublished": "2026-09-11T19:45:43.261Z", "dateUpdated": "2026-09-11T19:45:43.261Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:45:43.261Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/mdsmap.c"], "versions": [{"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "736adee11af36e407ed902264f8b2fb5cf94b62f", "status": "affected", "versionType": "git"}, {"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "4d298880f82c42383b36946bafde7ccf4d804c9b", "status": "affected", "versionType": "git"}, {"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "96c3f5fbb0d5386e7111426f047f98cec4586674", "status": "affected", "versionType": "git"}, {"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "aedc9053d909508a5f56c3f49f885fc030df4730", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/mdsmap.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.3-rc1"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89653", "lastModified": "2026-09-11T20:19:51.400", "metrics": {}, "published": "2026-09-11T20:19:51.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ceph: Linux kernel (Ceph): Denial of Service via out-of-bounds write in mdsmap decode", "id": "2532386", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532386"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's Ceph filesystem. This vulnerability occurs when a malicious or malformed MDSMap export_targets entry, controlled by a monitor, contains a rank value that exceeds the maximum allowed (CEPH_MAX_MDS) during the decoding process. This can lead to an out-of-bounds write, where the system attempts to write data beyond its designated memory area. Such an issue could result in a denial of service (DoS), making the system unresponsive or unstable."], "name": "CVE-2026-89653", "public_date": "2026-09-11T19:45:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89653\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89653\nhttps://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b\nhttps://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f\nhttps://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674\nhttps://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730"], "threat_severity": "Moderate"}

{"created": "2026-09-12T09:15:12.756937+00:00", "updated": "2026-09-12T15:30:16.636271+00:00", "vendors": []}