CVE-2026-89653

{"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": "2026-10-19T08:50:24.862Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:50:24.862Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - A crafted MDSMap arrives in CEPH_MSG_MDS_MAP over the Ceph messenger TCP session from a monitor or MDS; extra_mon_dispatch() and mds_dispatch() deliver it to ceph_mdsc_handle_mdsmap() on already-mounted CephFS/Rook/Kubernetes clients without a local syscall.\nAC:L - The monitor fully controls each export_targets[] u32; after the first map is stored, a later epoch reaches check_new_map() and set_bit() with an attacker-chosen bit number, overflowing the stack bitmap with no race or special layout.\nPR:N - The attacker is the remote Ceph monitor or MDS peer and needs no Linux UID, capability, or init-namespace root on the victim, matching other Ceph client decode CVEs such as CVE-2026-68159.\nUI:N - Once CephFS is mounted, MDS maps are subscribed and applied automatically in the ceph-msgr worker; a malicious peer can push a new epoch without any further interactive victim action.\nS:U - The stack out-of-bounds write corrupts kernel memory on the Ceph client host only and does not cross a VM, IOMMU, or sandbox security authority.\nC:H - set_bit() with an attacker-chosen rank writes past the fixed stack bitmap in check_new_map(), corrupting adjacent kernel stack contents; this memory-corruption primitive can be leveraged for information disclosure.\nI:H - The overflow is a stack out-of-bounds write of attacker-selected bits at a u32-controlled offset from the targets[] array, enabling control-flow hijack and arbitrary kernel writes.\nA:H - An out-of-range bit index makes set_bit() write off the stack object, causing a KASAN stack-out-of-bounds report or kernel oops/panic that a malicious monitor can repeat with each new map epoch."}]}], "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": "3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe", "status": "affected", "versionType": "git"}, {"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "8c823bbab3c24e657469a84db96902ba82d4e8bb", "status": "affected", "versionType": "git"}, {"version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "c4addccd05bacbef2144b4db14853d0308a218ac", "status": "affected", "versionType": "git"}, {"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": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "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", "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": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.157"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe"}, {"url": "https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb"}, {"url": "https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89653", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:25:22.176850Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:46.987Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89653", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:25:22.176850Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:25:23.035Z"}}], "cna": {"title": "ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - A crafted MDSMap arrives in CEPH_MSG_MDS_MAP over the Ceph messenger TCP session from a monitor or MDS; extra_mon_dispatch() and mds_dispatch() deliver it to ceph_mdsc_handle_mdsmap() on already-mounted CephFS/Rook/Kubernetes clients without a local syscall.\nAC:L - The monitor fully controls each export_targets[] u32; after the first map is stored, a later epoch reaches check_new_map() and set_bit() with an attacker-chosen bit number, overflowing the stack bitmap with no race or special layout.\nPR:N - The attacker is the remote Ceph monitor or MDS peer and needs no Linux UID, capability, or init-namespace root on the victim, matching other Ceph client decode CVEs such as CVE-2026-68159.\nUI:N - Once CephFS is mounted, MDS maps are subscribed and applied automatically in the ceph-msgr worker; a malicious peer can push a new epoch without any further interactive victim action.\nS:U - The stack out-of-bounds write corrupts kernel memory on the Ceph client host only and does not cross a VM, IOMMU, or sandbox security authority.\nC:H - set_bit() with an attacker-chosen rank writes past the fixed stack bitmap in check_new_map(), corrupting adjacent kernel stack contents; this memory-corruption primitive can be leveraged for information disclosure.\nI:H - The overflow is a stack out-of-bounds write of attacker-selected bits at a u32-controlled offset from the targets[] array, enabling control-flow hijack and arbitrary kernel writes.\nA:H - An out-of-range bit index makes set_bit() write off the stack object, causing a KASAN stack-out-of-bounds report or kernel oops/panic that a malicious monitor can repeat with each new map epoch."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe", "versionType": "git"}, {"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "8c823bbab3c24e657469a84db96902ba82d4e8bb", "versionType": "git"}, {"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "c4addccd05bacbef2144b4db14853d0308a218ac", "versionType": "git"}, {"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "736adee11af36e407ed902264f8b2fb5cf94b62f", "versionType": "git"}, {"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "4d298880f82c42383b36946bafde7ccf4d804c9b", "versionType": "git"}, {"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "96c3f5fbb0d5386e7111426f047f98cec4586674", "versionType": "git"}, {"status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "lessThan": "aedc9053d909508a5f56c3f49f885fc030df4730", "versionType": "git"}], "programFiles": ["fs/ceph/mdsmap.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ceph/mdsmap.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe"}, {"url": "https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb"}, {"url": "https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac"}, {"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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:50:24.862Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89653", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:50:24.862Z", "dateReserved": "2026-09-11T19:38:34.742Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:45:43.261Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"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": "3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe", "status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "versionType": "git"}, {"lessThan": "8c823bbab3c24e657469a84db96902ba82d4e8bb", "status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "versionType": "git"}, {"lessThan": "c4addccd05bacbef2144b4db14853d0308a218ac", "status": "affected", "version": "d517b3983dd3106ca92d6c5d0d09415a4a09481c", "versionType": "git"}, {"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": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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", "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": "2026-10-19T09:18:02.800", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89653", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:25:22.176850Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:51.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe"}, {"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/8c823bbab3c24e657469a84db96902ba82d4e8bb"}, {"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"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac"}], "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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d517b3983dd3106ca92d6c5d0d09415a4a09481c,736adee11af36e407ed902264f8b2fb5cf94b62f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d517b3983dd3106ca92d6c5d0d09415a4a09481c,4d298880f82c42383b36946bafde7ccf4d804c9b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d517b3983dd3106ca92d6c5d0d09415a4a09481c,96c3f5fbb0d5386e7111426f047f98cec4586674)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d517b3983dd3106ca92d6c5d0d09415a4a09481c,aedc9053d909508a5f56c3f49f885fc030df4730)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T09:15:12.756937+00:00", "updated": "2026-09-15T21:00:17.860233+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}