338 lines
17 KiB
JSON
338 lines
17 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-2026-31708",
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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": "2026-03-09T15:48:24.132Z",
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"datePublished": "2026-05-01T13:56:05.880Z",
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"dateUpdated": "2026-10-19T19:06:06.825Z"
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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": "2026-08-05T12:24:43.143Z"
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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\nsmb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path\n\nsmb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL\nand the default QUERY_INFO path. The QUERY_INFO branch clamps\nqi.input_buffer_length to the server-reported OutputBufferLength and then\ncopies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but\nit never verifies that the flexible-array payload actually fits within\nrsp_iov[1].iov_len.\n\nA malicious server can return OutputBufferLength larger than the actual\nQUERY_INFO response, causing copy_to_user() to walk past the response\nbuffer and expose adjacent kernel heap to userspace.\n\nGuard the QUERY_INFO copy with a bounds check on the actual Buffer\npayload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length)\nrather than an open-coded addition so the guard cannot overflow on\n32-bit builds."
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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:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
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"baseScore": 8.1,
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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:N - The attacker-controlled data is an SMB2 QUERY_INFO response sent by a remote SMB server to the kernel SMB client over the network. The vulnerable copy is reached after the client issues the ioctl-triggered compound open/query/close request.\nAC:L - There is no race or fragile timing requirement; a malicious server controls the malformed response fields and can reliably make the advertised copy length exceed the actual response payload. CIFS/SMB client support is common and the affected SMB2+ path is not a rare configuration.\nPR:N - The malicious SMB server needs no privileges on the vulnerable client. The affected PASSTHRU_QUERY_INFO branch has no CAP_SYS_ADMIN check, unlike the FSCTL and SET_INFO branches.\nUI:R - A victim or local process must have mounted/accessed the SMB share and issued the CIFS_QUERY_INFO ioctl. The malicious server cannot reach this ioctl path entirely unsolicited.\nS:U - The impact is within the vulnerable kernel/client system security scope. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The bug is an out-of-bounds kernel read copied to userspace from beyond the received SMB response buffer. The overread can expose adjacent kernel heap data and is not strictly bounded to only a few harmless bytes.\nI:N - The vulnerable operation is a read from kernel memory followed by copy_to_user. It does not provide a kernel write primitive or direct data modification.\nA:H - The same attacker-controlled length can drive copy_to_user far beyond the valid response buffer. That can trigger kernel faults or hardened usercopy failures, so a kernel crash is a defensible impact."
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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/client/smb2ops.c"
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],
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"versions": [
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{
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"version": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "e66bdc0704977ecee667a81d38255b579c2353d0",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "9e203dbb5402897c43130fb171a2617008a91f45",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "1dd757379997b71a328a4b591ffaf481acd0ead1",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "a34d456934fe42e4da5d2cc07787bf418bee99c6",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "ac2f14e4705d020f04e806efa0d49ab8dc2b145f",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "078fae8f50adebb903ccf2252b44391324571e78",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "85fd46ee26a11841c670449508025965f61ce131",
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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": "f5778c398713692a16150ae96e5c8270bab8399f",
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"lessThan": "a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e",
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"status": "affected",
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"versionType": "git"
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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/client/smb2ops.c"
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],
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"versions": [
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{
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"version": "5.1",
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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": "5.1",
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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": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.210",
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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": "6.1.175",
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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": "6.6.136",
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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": "6.12.84",
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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": "6.18.25",
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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": "7.0.2",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "5.1",
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"versionEndExcluding": "5.10.259"
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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": "5.1",
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"versionEndExcluding": "5.15.210"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.1",
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"versionEndExcluding": "6.1.175"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.1",
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"versionEndExcluding": "6.6.136"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.18.25"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.1",
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"versionEndExcluding": "7.0.2"
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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": "5.1",
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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/e66bdc0704977ecee667a81d38255b579c2353d0"
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},
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{
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"url": "https://git.kernel.org/stable/c/9e203dbb5402897c43130fb171a2617008a91f45"
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},
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{
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"url": "https://git.kernel.org/stable/c/1dd757379997b71a328a4b591ffaf481acd0ead1"
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},
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{
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"url": "https://git.kernel.org/stable/c/a34d456934fe42e4da5d2cc07787bf418bee99c6"
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},
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{
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"url": "https://git.kernel.org/stable/c/ac2f14e4705d020f04e806efa0d49ab8dc2b145f"
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},
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{
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"url": "https://git.kernel.org/stable/c/078fae8f50adebb903ccf2252b44391324571e78"
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},
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{
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"url": "https://git.kernel.org/stable/c/85fd46ee26a11841c670449508025965f61ce131"
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},
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{
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"url": "https://git.kernel.org/stable/c/a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e"
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}
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],
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"title": "smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path",
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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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"adp": [
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{
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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:18:04.567Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "*",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
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}
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]
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-31708",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:12:45.456025Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T19:06:06.825Z"
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}
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}
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]
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}
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} |