279 lines
15 KiB
JSON
279 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89792",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.766Z",
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"datePublished": "2026-09-16T08:50:06.516Z",
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"dateUpdated": "2026-10-19T08:52:47.159Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:52:47.159Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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 → ipc_validate_msg → 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/mgmt/share_config.c",
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"fs/smb/server/transport_ipc.c"
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],
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"versions": [
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{
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"version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300",
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"lessThan": "df8aa4a09733c4d3974b1db32c1782b3aad3a151",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd",
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"lessThan": "0127f1c119bde40578f4d25f5d17333b4e75de8c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a637fabac554270a851033f5ab402ecb90bc479c",
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"lessThan": "fd636a87161def6e35876ab7943641ce457974c8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
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"lessThan": "ffa507f5f774cb4d45136b106989ebc051361263",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
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"lessThan": "cd2bcee450bc94770be56c0b896c1a1dc6838bd8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
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"lessThan": "61a8d06600c8c397f9a7e01940479d4c94a82f5f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
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"lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "76af689a45aa44714b46d1a7de4ffdf851ded896",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.15.157",
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"lessThan": "5.15.222",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.85",
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"lessThan": "6.1.189",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.26",
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"lessThan": "6.6.158",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.8.5",
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"lessThan": "6.9",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/mgmt/share_config.c",
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"fs/smb/server/transport_ipc.c"
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],
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"versions": [
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{
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"version": "6.9",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.9",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15.157",
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"versionEndExcluding": "5.15.222"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.85",
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"versionEndExcluding": "6.1.189"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.26",
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"versionEndExcluding": "6.6.158"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.12.111"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.18.53"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "7.2.6"
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{
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "7.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.8.5"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"
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},
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{
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"url": "https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c"
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},
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{
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"url": "https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8"
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},
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{
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"url": "https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263"
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},
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{
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"url": "https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"
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},
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{
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"url": "https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"
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},
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{
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"url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"
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}
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],
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"title": "ksmbd: prevent out-of-bounds reads in share config responses",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |