CVE-2026-89792

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89792", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.766Z", "datePublished": "2026-09-16T08:50:06.516Z", "dateUpdated": "2026-10-19T08:52:47.159Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:52:47.159Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Malformed payload_sz/veto_list_sz and unterminated veto/path bytes are consumed from a ksmbd generic-netlink SHARE_CONFIG_RESPONSE (handle_generic_event \u2192 ipc_validate_msg \u2192 share_config_request), not from SMB PDUs. A remote TREE_CONNECT only creates the pending IPC request; the attacker must be local to inject or control that response.\nAC:L - The attacker fully controls the crafted netlink length fields and can set payload_sz to 0 or omit NULs so the old checks pass. Pending handles come from a small IDA and can be brute-forced against a TREE_CONNECT the attacker also triggers; no victim timing or rare config is required.\nPR:L - handle_generic_event requires CAP_NET_ADMIN only when CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN is set; SMBD_GENL is netns-aware, has no GENL_ADMIN_PERM, and does not bind responses to ksmbd_tools_pid. That capability is Low, and builds that disable the check allow any local user to send the message.\nUI:N - The attacker sends the malformed SHARE_CONFIG_RESPONSE and can issue the matching SMB2 TREE_CONNECT themselves; no separate victim or administrator action is required once ksmbd is running.\nS:U - The out-of-bounds reads and any resulting oops remain inside the ksmbd/kernel security authority on the host. This is not a VM escape, IOMMU/DMA bypass, or other cross-boundary impact.\nC:H - With payload_sz==0 the kernel kstrndup()s up to PATH_MAX bytes past the IPC object, and parse_veto_list() uses unbounded strlen()/kstrdup() when the veto buffer lacks a NUL within veto_list_sz. Those are large kernel-heap over-reads, not a few bounded bytes.\nI:N - The defects are out-of-bounds reads (strlen, kstrndup, kstrdup) into newly allocated strings; there is no out-of-bounds write or control-flow hijack primitive. A local IPC sender can already supply a well-formed share path without this bug.\nA:H - Walking strlen() or kstrndup(..., PATH_MAX) off the end of the IPC slab into unmapped memory oopses the ksmbd worker. The attacker can repeat the crafted response against further TREE_CONNECT-triggered requests and crash the kernel at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/mgmt/share_config.c", "fs/smb/server/transport_ipc.c"], "versions": [{"version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300", "lessThan": "df8aa4a09733c4d3974b1db32c1782b3aad3a151", "status": "affected", "versionType": "git"}, {"version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd", "lessThan": "0127f1c119bde40578f4d25f5d17333b4e75de8c", "status": "affected", "versionType": "git"}, {"version": "a637fabac554270a851033f5ab402ecb90bc479c", "lessThan": "fd636a87161def6e35876ab7943641ce457974c8", "status": "affected", "versionType": "git"}, {"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "lessThan": "ffa507f5f774cb4d45136b106989ebc051361263", "status": "affected", "versionType": "git"}, {"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "lessThan": "cd2bcee450bc94770be56c0b896c1a1dc6838bd8", "status": "affected", "versionType": "git"}, {"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "lessThan": "61a8d06600c8c397f9a7e01940479d4c94a82f5f", "status": "affected", "versionType": "git"}, {"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34", "status": "affected", "versionType": "git"}, {"version": "76af689a45aa44714b46d1a7de4ffdf851ded896", "status": "affected", "versionType": "git"}, {"version": "5.15.157", "lessThan": "5.15.222", "status": "affected", "versionType": "semver"}, {"version": "6.1.85", "lessThan": "6.1.189", "status": "affected", "versionType": "semver"}, {"version": "6.6.26", "lessThan": "6.6.158", "status": "affected", "versionType": "semver"}, {"version": "6.8.5", "lessThan": "6.9", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/mgmt/share_config.c", "fs/smb/server/transport_ipc.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "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": "5.15.157", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.85", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.26", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"}, {"url": "https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c"}, {"url": "https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8"}, {"url": "https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263"}, {"url": "https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"}, {"url": "https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"}, {"url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"}], "title": "ksmbd: prevent out-of-bounds reads in share config responses", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/mgmt/share_config.c", "fs/smb/server/transport_ipc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "df8aa4a09733c4d3974b1db32c1782b3aad3a151", "status": "affected", "version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300", "versionType": "git"}, {"lessThan": "0127f1c119bde40578f4d25f5d17333b4e75de8c", "status": "affected", "version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd", "versionType": "git"}, {"lessThan": "fd636a87161def6e35876ab7943641ce457974c8", "status": "affected", "version": "a637fabac554270a851033f5ab402ecb90bc479c", "versionType": "git"}, {"lessThan": "ffa507f5f774cb4d45136b106989ebc051361263", "status": "affected", "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "versionType": "git"}, {"lessThan": "cd2bcee450bc94770be56c0b896c1a1dc6838bd8", "status": "affected", "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "versionType": "git"}, {"lessThan": "61a8d06600c8c397f9a7e01940479d4c94a82f5f", "status": "affected", "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "versionType": "git"}, {"lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34", "status": "affected", "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "versionType": "git"}, {"status": "affected", "version": "76af689a45aa44714b46d1a7de4ffdf851ded896", "versionType": "git"}, {"lessThan": "5.15.222", "status": "affected", "version": "5.15.157", "versionType": "semver"}, {"lessThan": "6.1.189", "status": "affected", "version": "6.1.85", "versionType": "semver"}, {"lessThan": "6.6.158", "status": "affected", "version": "6.6.26", "versionType": "semver"}, {"lessThan": "6.9", "status": "affected", "version": "6.8.5", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/mgmt/share_config.c", "fs/smb/server/transport_ipc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "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\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length."}], "id": "CVE-2026-89792", "lastModified": "2026-10-19T09:18:22.900", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T09:17:10.040", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a677ebd8ca2f2632ccdecbad7b87641274e15aac,61a8d06600c8c397f9a7e01940479d4c94a82f5f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a677ebd8ca2f2632ccdecbad7b87641274e15aac,f25e93768fcc5d8287e50b1ec52a42e4c276df34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a637fabac554270a851033f5ab402ecb90bc479c"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "76af689a45aa44714b46d1a7de4ffdf851ded896"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.157,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.85,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.26,6.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.8.5,6.9)"}}], "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": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.6,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc2,*]"}}], "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": "2026-09-16T14:30:10.708186+00:00", "updated": "2026-09-20T04:45:16.994976+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125"]}