314 lines
16 KiB
JSON
314 lines
16 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-2026-72310",
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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": "2026-08-09T03:40:39.918Z",
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"datePublished": "2026-08-15T05:55:26.539Z",
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"dateUpdated": "2026-10-16T18:55:16.690Z"
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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": "2026-08-17T05:42:38.636Z"
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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 overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds."
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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:L/UI:N/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 - Exploitation requires processing a crafted SMB2 IOCTL response from a malicious SMB/CIFS server over TCP; the bug is in client-side parsing of attacker-controlled network protocol fields, not in a purely local code path.\nAC:L - A malicious server can reliably supply OutputOffset and OutputCount values that wrap the 32-bit bounds check and pass validation, deterministically triggering the out-of-bounds copy_to_user() without races or special victim state.\nPR:L - The PASSTHRU_FSCTL ioctl path requires CAP_SYS_ADMIN, which an unprivileged local user can obtain inside a user namespace and use to mount CIFS and issue CIFS_QUERY_INFO against an attacker-controlled server.\nUI:N - In the highest-impact scenario the attacker controls the full chain (user-namespace mount plus ioctl) and needs no separate victim action beyond their own exploitation steps.\nS:U - Impact is disclosure of kernel heap memory to the calling userspace process within the same kernel security authority; it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - The integer overflow bypasses bounds checking so copy_to_user() reads qi.input_buffer_length bytes from io_rsp plus attacker-chosen OutputOffset outside the SMB response buffer, leaking adjacent kernel memory to userspace.\nI:N - The flaw is an out-of-bounds kernel read copied to userspace; it does not modify kernel memory, corrupt metadata, or provide a write or code-execution primitive.\nA:H - Reading far outside the allocated SMB response buffer can access unmapped kernel pages during copy_to_user(), causing a kernel fault, oops, or panic in addition to information disclosure."
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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": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "175357ee0c596cb82054650dfa32fda51ad35aaa",
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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": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "dbd126539c098dba3159ce7d34b10b2daddcbd0f",
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"status": "affected",
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},
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{
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"version": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "63feb687e89a3a52a31e6e01764117cc500f1974",
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"status": "affected",
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},
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{
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"version": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "160045fc943f6c46b227644261252c8a22b8a87a",
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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": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "b30771b69eafae750afb7385fbcc3d77ed3f3670",
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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": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "1627e7d5c9b09721a141d07cedb178882f1ded67",
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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": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9",
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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": "2b1116bbe898aefdf584838448c6869f69851e0f",
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"lessThan": "a4f27ad055392fa164f5649e89a3637b033c5fcc",
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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": "2005c32ec99ee2490e8131b3953f3f212009ffea",
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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": "5.4.69",
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"lessThan": "5.5",
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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/client/smb2ops.c"
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],
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"versions": [
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{
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"version": "5.5",
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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": "5.5",
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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": "5.10.261",
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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": "5.15.212",
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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": "6.1.178",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.5",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa"
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},
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{
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"url": "https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f"
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},
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{
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"url": "https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974"
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},
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{
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"url": "https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a"
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},
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{
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"url": "https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670"
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},
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{
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"url": "https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67"
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},
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{
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"url": "https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"
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},
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{
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"url": "https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"
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}
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],
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"title": "smb: client: fix overflow in passthrough ioctl bounds check",
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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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"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-2026-72310",
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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": "2026-10-16T18:46:23.070703Z"
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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": "2026-10-16T18:55:16.690Z"
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}
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}
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]
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}
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} |