201 lines
11 KiB
JSON
201 lines
11 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-2025-40084",
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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": "2025-04-16T07:20:57.161Z",
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"datePublished": "2025-10-29T13:37:03.185Z",
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"dateUpdated": "2026-08-05T12:07:38.947Z"
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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": "2026-08-05T12:07:38.947Z"
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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: transport_ipc: validate payload size before reading handle\n\nhandle_response() dereferences the payload as a 4-byte handle without\nverifying that the declared payload size is at least 4 bytes. A malformed\nor truncated message from ksmbd.mountd can lead to a 4-byte read past the\ndeclared payload size. Validate the size before dereferencing.\n\nThis is a minimal fix to guard the initial handle read."
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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 - The vulnerable code is reached only via a generic netlink message to the `SMBD_GENL` family (`handle_generic_event` → `handle_response`), which requires a local socket on the machine; a remote SMB client on TCP/445 cannot inject IPC responses.\nAC:L - The attacker fully controls the crafted netlink message — a zero-length `KSMBD_EVENT_RPC_RESPONSE`/`SPNEGO_AUTHEN_RESPONSE` attribute followed by a chosen nlattr header supplies both the undersized `sz` and the out-of-bounds \"handle\" value, and IDA-allocated handles are small and brute-forceable.\nPR:L - The `netlink_capable(CAP_NET_ADMIN)` gate exists only when `CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN` is set, and builds that disable it let any unprivileged local user open a `NETLINK_GENERIC` socket and send the message; there is also no check binding the sender to the registered `ksmbd_tools_pid`.\nUI:N - The attacker sends the malformed netlink message directly; no victim action is needed beyond ksmbd already running, which is the normal state on an SMB server.\nS:U - The out-of-bounds read and the resulting fault stay within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The unchecked deref reads 4 bytes past the declared payload, and the undersized response it admits causes `ipc_validate_msg()` and the SPNEGO/RPC consumers to read fields beyond a tiny slab allocation, whose contents can be reflected back toward the SMB client.\nI:N - The `memcpy(entry->response, payload, sz)` is bounded by the same `sz` used for the allocation, so the bug yields no out-of-bounds write or other data-modification primitive.\nA:H - A zero-length payload makes `kvzalloc(0)` return `ZERO_SIZE_PTR`, which passes the non-NULL check and is then dereferenced in `ipc_validate_msg()`, producing a kernel oops that is repeatable 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/transport_ipc.c"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "a02e432d5130da4c723aabe1205bac805889fdb2",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "2dc125f5da134c0915a840b62565c60a595673dd",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "898d527ed94c19980a4d848f10057f1fed578ffb",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "867ffd9d67285612da3f0498ca618297f8e41f01",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0",
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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/server/transport_ipc.c"
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],
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"versions": [
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{
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"version": "5.15",
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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": "5.15",
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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": "6.1.158",
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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": "6.6.115",
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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": "6.12.56",
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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": "6.17.6",
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"lessThanOrEqual": "6.17.*",
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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",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "6.1.158"
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},
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a02e432d5130da4c723aabe1205bac805889fdb2"
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},
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{
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"url": "https://git.kernel.org/stable/c/2dc125f5da134c0915a840b62565c60a595673dd"
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},
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{
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"url": "https://git.kernel.org/stable/c/898d527ed94c19980a4d848f10057f1fed578ffb"
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{
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"url": "https://git.kernel.org/stable/c/867ffd9d67285612da3f0498ca618297f8e41f01"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f40e50ceb99fc8ef37e5c56e2ec1d162733fef0"
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}
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],
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"title": "ksmbd: transport_ipc: validate payload size before reading handle",
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