235 lines
12 KiB
JSON
235 lines
12 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-2025-40099",
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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": "2025-04-16T07:20:57.164Z",
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"datePublished": "2025-10-30T09:48:05.859Z",
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"dateUpdated": "2026-10-15T22:02:37.745Z"
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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": "2026-08-05T12:07:48.660Z"
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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\ncifs: parse_dfs_referrals: prevent oob on malformed input\n\nMalicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS\n\n- reply smaller than sizeof(struct get_dfs_referral_rsp)\n- reply with number of referrals smaller than NumberOfReferrals in the\nheader\n\nProcessing of such replies will cause oob.\n\nReturn -EINVAL error on such replies to prevent oob-s."
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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:N/S:U/C:H/I:L/A:H",
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"baseScore": 9.4,
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"baseSeverity": "CRITICAL"
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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 vulnerable parser operates directly on a FSCTL_DFS_GET_REFERRALS reply received from a remote SMB server over TCP/445, with both the buffer length (`OutputCount`) and the referral count attacker-controlled. A malicious, compromised, or MITM'd server reaches this code purely over the network.\nAC:L - The server sends one well-formed V3 referral (so the in-bounds VersionNumber check passes) together with NumberOfReferrals=0xFFFF, and the loop deterministically walks ~2.2 MB past the allocation. No race, no heap grooming, no memory-layout dependency.\nPR:N - The attacker is the remote SMB peer and needs no credentials or account on the victim client; the client initiates the connection and parses the reply. A network MITM on an unsigned/unencrypted SMB session can inject the malformed referral response with no privileges at all.\nUI:N - On an existing DFS mount the `dfs_cache_refresh` delayed work re-issues referral requests on a timer and re-queues itself indefinitely, so a compromised or MITM'd server triggers the parse with zero user action; reconnect/failover paths do the same.\nS:U - The out-of-bounds access is confined to the kernel's own heap within the same security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Unbounded out-of-bounds read of up to ~2.2 MB of adjacent kernel heap, far beyond a \"few bytes\"; the harvested ServerType/ReferralEntryFlags/TimeToLive values are stored into DFS cache entries and exposed to any local user through world-readable (0644) /proc/fs/cifs/dfscache.\nI:L - There is no out-of-bounds write, but uncontrolled out-of-bounds heap contents are written into `dfs_info3_param` fields and propagated into the client's cached DFS referral state (ttl, srvtype, ref_flags), a limited corruption of kernel-side data that the fix explicitly prevents.\nA:H - The linear ~2.2 MB walk past a small kmalloc object can strike an unmapped page and oops the kernel — reliably so on small-memory embedded/IoT clients, hardened allocators, and KASAN builds — and each malicious reply additionally forces a ~3 MB kcalloc, repeatable on every automatic refresh."
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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/misc.c"
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],
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"versions": [
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{
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"version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
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"lessThan": "cfacc7441f760e4a73cc71b6ff1635261d534657",
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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": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
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"lessThan": "15c73964da9df994302f579ed14ee5fdbce7a332",
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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": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
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"lessThan": "8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058",
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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": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
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"lessThan": "bb0f2e66e1ac043a5b238f5bcab4f26f3c317039",
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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": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
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"lessThan": "6447b0e355562a1ff748c4a2ffb89aae7e84d2c9",
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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/misc.c"
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],
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"versions": [
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{
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"version": "4.11",
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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": "4.11",
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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": "6.6.114",
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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": "6.12.55",
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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": "6.17.5",
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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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{
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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": "4.11",
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"versionEndExcluding": "6.1.158"
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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": "4.11",
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"versionEndExcluding": "6.6.114"
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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": "4.11",
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"versionEndExcluding": "6.12.55"
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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": "4.11",
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"versionEndExcluding": "6.17.5"
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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": "4.11",
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"versionEndExcluding": "6.18"
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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/cfacc7441f760e4a73cc71b6ff1635261d534657"
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},
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{
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"url": "https://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332"
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},
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{
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"url": "https://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058"
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},
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{
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"url": "https://git.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039"
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},
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{
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"url": "https://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9"
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}
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],
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"title": "cifs: parse_dfs_referrals: prevent oob on malformed input",
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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-2025-40099",
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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": "yes"
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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": "2026-10-15T21:56:50.620033Z"
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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": "2026-10-15T22:02:37.745Z"
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}
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}
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]
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}
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} |