CVE-2026-89657

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89657", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.743Z", "datePublished": "2026-09-11T19:45:46.118Z", "dateUpdated": "2026-10-19T08:50:28.836Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:50:28.836Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: validate OSD extent maps before cursor advance\n\nnet/ceph/osd_client.c:osd_sparse_read() validates that the sparse-read\ndata length matches the summed extent lengths, but it does not validate\nthat each OSD-supplied extent is monotonic and lies inside the original\nrequest range. A malformed authenticated OSD reply can advertise a\nfar-forward nonzero extent offset with a matching data length and make\nthe client advance the message-data cursor beyond the request buffer.\nThis reaches the BUG_ON(!*length) assertion in ceph_msg_data_next() from\nthe client receive path.\n\nImpact: A malicious or compromised authenticated Ceph OSD peer can crash\na kernel Ceph client via a malformed sparse-read reply.\n\nReject sparse extent maps that overflow, move backwards, overlap, or\nextend outside the original sparse-read request before advancing the\ncursor.\n\n[ idryomov: perform sparse_extent_map_valid() check a bit earlier,\n in CEPH_SPARSE_READ_DATA_LEN instead of CEPH_SPARSE_READ_DATA_PRE\n state ]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The malformed sparse-read extent map is consumed in osd_sparse_read() on the Ceph messenger TCP receive path (messenger_v1/v2) when a kernel CephFS client handles an MOSDOpReply from a remote OSD; no local syscall or ioctl is required to parse the reply.\nAC:L - A malicious OSD fully controls the sparse extent offsets and lengths and can advertise a far-forward nonzero extent with a matching data length, deterministically advancing the message-data cursor past the request buffer into BUG_ON(!*length) in ceph_msg_data_next() with no race or special memory layout.\nPR:N - The attacker acts as a remote Ceph OSD peer on a compromised or attacker-controlled cluster and needs no account, capabilities, or user-namespace privileges on the victim Linux host; any kernel CephFS client connected to that cluster is exposed.\nUI:N - Once CephFS is mounted with fscrypt-encrypted files or the sparseread option, netfs/buffered reads and encrypted RMW writes issue CEPH_OSD_OP_SPARSE_READ as normal I/O; the OSD can crash the client on the next such reply without further victim action at exploit time.\nS:U - The BUG_ON panic occurs in the kernel Ceph client's receive path on the same host and does not cross a VM, IOMMU, or sandbox boundary to another security authority.\nC:N - ceph_msg_data_next() hits BUG_ON(!*length) and related cursor assertions when the buffer is exhausted, before any out-of-bounds page access; there is no use-after-free, OOB read, or other information-disclosure primitive.\nI:N - Cursor over-advance is stopped by BUG_ON assertions rather than writing past the allocated request pages; hole-zeroing via zero_user_segment stays inside the destination buffer until the panic, so there is no arbitrary kernel write or control-flow hijack.\nA:H - BUG_ON(!*length) in ceph_msg_data_next() on the client receive path causes a kernel oops or panic, fully denying availability of the affected Ceph client host until reboot."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ceph/osd_client.c"], "versions": [{"version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "94ae5145c520618802b0a24c047dcd5f05835db8", "status": "affected", "versionType": "git"}, {"version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "058ffa81f9440c5b4714685611cf697fd3739ec9", "status": "affected", "versionType": "git"}, {"version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "2571b35883268a266554e80d368e67fdfea7fb9d", "status": "affected", "versionType": "git"}, {"version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "201db408872ca12cf09e36bf0f560138c3dcfa1c", "status": "affected", "versionType": "git"}, {"version": "f628d799972799023d32c2542bb2639eb8c4f84e", "lessThan": "9ec08b7499a62c6d4afa93d36ab47a43fcad57d1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ceph/osd_client.c"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "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": "6.6", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/94ae5145c520618802b0a24c047dcd5f05835db8"}, {"url": "https://git.kernel.org/stable/c/058ffa81f9440c5b4714685611cf697fd3739ec9"}, {"url": "https://git.kernel.org/stable/c/2571b35883268a266554e80d368e67fdfea7fb9d"}, {"url": "https://git.kernel.org/stable/c/201db408872ca12cf09e36bf0f560138c3dcfa1c"}, {"url": "https://git.kernel.org/stable/c/9ec08b7499a62c6d4afa93d36ab47a43fcad57d1"}], "title": "libceph: validate OSD extent maps before cursor advance", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ceph/osd_client.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "94ae5145c520618802b0a24c047dcd5f05835db8", "status": "affected", "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "versionType": "git"}, {"lessThan": "058ffa81f9440c5b4714685611cf697fd3739ec9", "status": "affected", "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "versionType": "git"}, {"lessThan": "2571b35883268a266554e80d368e67fdfea7fb9d", "status": "affected", "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "versionType": "git"}, {"lessThan": "201db408872ca12cf09e36bf0f560138c3dcfa1c", "status": "affected", "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "versionType": "git"}, {"lessThan": "9ec08b7499a62c6d4afa93d36ab47a43fcad57d1", "status": "affected", "version": "f628d799972799023d32c2542bb2639eb8c4f84e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ceph/osd_client.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"lessThan": "6.6", "status": "unaffected", "version": "0", "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\nlibceph: validate OSD extent maps before cursor advance\n\nnet/ceph/osd_client.c:osd_sparse_read() validates that the sparse-read\ndata length matches the summed extent lengths, but it does not validate\nthat each OSD-supplied extent is monotonic and lies inside the original\nrequest range. A malformed authenticated OSD reply can advertise a\nfar-forward nonzero extent offset with a matching data length and make\nthe client advance the message-data cursor beyond the request buffer.\nThis reaches the BUG_ON(!*length) assertion in ceph_msg_data_next() from\nthe client receive path.\n\nImpact: A malicious or compromised authenticated Ceph OSD peer can crash\na kernel Ceph client via a malformed sparse-read reply.\n\nReject sparse extent maps that overflow, move backwards, overlap, or\nextend outside the original sparse-read request before advancing the\ncursor.\n\n[ idryomov: perform sparse_extent_map_valid() check a bit earlier,\n in CEPH_SPARSE_READ_DATA_LEN instead of CEPH_SPARSE_READ_DATA_PRE\n state ]"}], "id": "CVE-2026-89657", "lastModified": "2026-10-19T09:18:03.503", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:51.940", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/058ffa81f9440c5b4714685611cf697fd3739ec9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/201db408872ca12cf09e36bf0f560138c3dcfa1c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2571b35883268a266554e80d368e67fdfea7fb9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/94ae5145c520618802b0a24c047dcd5f05835db8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ec08b7499a62c6d4afa93d36ab47a43fcad57d1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: libceph: Denial of Service in Linux kernel via malformed sparse-read replies", "id": "2532301", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532301"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in libceph in the Linux kernel. A malicious or compromised authenticated Ceph Object Storage Device (OSD) peer could send a specially crafted sparse-read reply that lacks proper validation of extent maps. This could cause the client to advance its message-data cursor beyond the request buffer, leading to a kernel crash and a Denial of Service (DoS)."], "name": "CVE-2026-89657", "public_date": "2026-09-11T19:45:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89657\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89657\nhttps://git.kernel.org/stable/c/058ffa81f9440c5b4714685611cf697fd3739ec9\nhttps://git.kernel.org/stable/c/201db408872ca12cf09e36bf0f560138c3dcfa1c\nhttps://git.kernel.org/stable/c/2571b35883268a266554e80d368e67fdfea7fb9d\nhttps://git.kernel.org/stable/c/9ec08b7499a62c6d4afa93d36ab47a43fcad57d1"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f628d799972799023d32c2542bb2639eb8c4f84e,058ffa81f9440c5b4714685611cf697fd3739ec9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f628d799972799023d32c2542bb2639eb8c4f84e,2571b35883268a266554e80d368e67fdfea7fb9d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f628d799972799023d32c2542bb2639eb8c4f84e,201db408872ca12cf09e36bf0f560138c3dcfa1c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f628d799972799023d32c2542bb2639eb8c4f84e,9ec08b7499a62c6d4afa93d36ab47a43fcad57d1)"}}], "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": "6.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.6)"}}, {"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": "2026-09-12T05:00:08.298353+00:00", "updated": "2026-09-15T21:00:17.858142+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}