284 lines
15 KiB
JSON
284 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-2026-74608",
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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": "2026-08-15T05:44:03.920Z",
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"datePublished": "2026-08-22T15:31:55.298Z",
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"dateUpdated": "2026-10-16T19:06:00.915Z"
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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": "2026-08-25T05:40:33.533Z"
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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 use-after-free in cifs_try_adding_channels()\n\ncifs_try_adding_channels() takes a temporary reference to an interface\nbefore dropping iface_lock. If cifs_ses_add_channel() fails, it drops\nthat reference and then increments iface->weight_fulfilled.\n\nA concurrent interface list refresh can remove the list reference while\nchannel creation is in progress. In that case, the failure-path\nkref_put() releases the last reference and frees iface. Updating\nweight_fulfilled afterward then accesses freed memory.\n\nIncrement weight_fulfilled before dropping the temporary reference,\nkeeping iface alive for the final access."
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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:H/A:H",
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"baseScore": 9.8,
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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 flaw is in the kernel SMB3 client multichannel path reached while handling remote SMB/CIFS server traffic (channel setup, reconnect, and FSCTL_QUERY_NETWORK_INTERFACE_INFO responses) over TCP, so a malicious or compromised SMB server can trigger it from the network.\nAC:L - A hostile SMB server can force cifs_ses_add_channel() to fail and concurrently drive interface-list refresh during the unlocked window; the attacker controls both sides of the race via reconnects, binding failures, and crafted interface responses with retries.\nPR:N - The attacker only needs to operate the malicious SMB server peer; no credentials, local shell access, or privileges on the victim host are required once the client has an SMB3 multichannel session to that server.\nUI:N - After an SMB3 multichannel mount exists, kernel delayed query_interfaces work, automatic reconnect on dropped TCP, and post-mount channel scaling invoke cifs_try_adding_channels() without further user action, letting the server trigger exploitation repeatedly.\nS:U - The UAF corrupts client kernel heap state within the same host kernel security authority and does not inherently cross a VM, container, or IOMMU security boundary.\nC:H - Writing to a freed cifs_server_iface slab object is a use-after-free; attacker-influenced heap grooming can reclaim the object and enable arbitrary kernel memory disclosure via corrupted or overlapping live allocations.\nI:H - The post-free weight_fulfilled increment is a kernel heap write after free that can corrupt adjacent slab objects and be leveraged into arbitrary write or control-flow hijacking through heap shaping.\nA:H - The use-after-free can cause KASAN-detectable slab corruption, kernel oops, or panic, and a malicious server can retrigger it by repeating failed channel opens with concurrent interface-list refresh on reconnect."
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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/sess.c"
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],
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"versions": [
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{
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"version": "cbc53148cc0946b72d62a3c53870cb22ce4ec284",
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"lessThan": "64d7584e62ac8cdc750455c5fdc6008fc2de4f06",
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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": "cff97d683a083b862a8bb24309e0f4d2d928128a",
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"lessThan": "c292d4686f717c03e5022fc4ae7c782f39a94915",
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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": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
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"lessThan": "47dfac48bce7198ad4f1a388fc8c9491f878ac3b",
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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": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
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"lessThan": "1ffacbadc14530e55b8d86f7b917524f6a0fb891",
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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": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
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"lessThan": "1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805",
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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": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
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"lessThan": "4986410316b1ae0e63c6ce418e4eb196723626e7",
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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": "22a6c5b3425f327e7f4c3606a72277dce82c7d83",
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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": "6.1.78",
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"lessThan": "6.1.183",
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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": "6.6.17",
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"lessThan": "6.6.152",
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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": "6.7.5",
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"lessThan": "6.8",
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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/sess.c"
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],
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"versions": [
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{
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"version": "6.8",
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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": "6.8",
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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": "6.1.183",
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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": "6.6.152",
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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": "6.12.104",
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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": "6.18.45",
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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": "7.1.9",
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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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{
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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": "6.1.78",
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"versionEndExcluding": "6.1.183"
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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": "6.6.17",
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"versionEndExcluding": "6.6.152"
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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",
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"versionEndExcluding": "6.12.104"
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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/64d7584e62ac8cdc750455c5fdc6008fc2de4f06"
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},
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{
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"url": "https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915"
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},
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{
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"url": "https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b"
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},
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{
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"url": "https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891"
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},
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{
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"url": "https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805"
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},
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{
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"url": "https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7"
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}
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],
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"title": "smb: client: Fix use-after-free in cifs_try_adding_channels()",
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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-2026-74608",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:02:11.593248Z"
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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": "2026-10-16T19:06:00.915Z"
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}
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}
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]
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}
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} |