298 lines
16 KiB
JSON
298 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-2026-74475",
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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": "2026-08-15T05:44:03.903Z",
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"datePublished": "2026-08-15T12:27:10.685Z",
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"dateUpdated": "2026-10-16T19:05:48.322Z"
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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": "2026-08-19T16:37:28.096Z"
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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\nvxlan: use neigh_ha_snapshot() in route_shortcircuit()\n\nThe neighbour hardware address n->ha can be updated asynchronously by the\nneighbour subsystem, protected by n->ha_lock seqlock. Reading n->ha without\nholding the seqlock loop can lead to torn reads or reading a partially updated\nMAC address.\n\nUse neigh_ha_snapshot() in route_shortcircuit() to safely copy n->ha under\nread_seqbegin()/read_seqretry() lock protection before using it.\n\nNote that arp_reduce() and neigh_reduce() seem to have the same issue\nleft for future patches."
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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:C/C:H/I:H/A:L",
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"baseScore": 10,
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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 - route_shortcircuit() runs on the vxlan_xmit() transmit path when overlay IP/IPv6 traffic is encapsulated; in cloud/SDN VTEP deployments a remote tenant can drive dev_queue_xmit() through bridge/IP forwarding without any local syscall or netlink access.\nAC:L - The attacker controls both sides of the race by concurrently sending overlay traffic that hits route_shortcircuit() and generating neighbour ha updates (ARP/NDP churn); repeated attempts do not depend on victim state or uncontrollable memory layout.\nPR:N - Exploitation requires only the ability to send overlay/underlay packets to a VTEP that already has VXLAN_F_RSC and router FDB entries configured by infrastructure; no CAP_NET_ADMIN, root, or host credentials are needed on the victim.\nUI:N - Triggering is automatic during kernel packet forwarding and VXLAN encapsulation once matching traffic flows; no mount, file open, or other victim action is required beyond normal overlay operation.\nS:C - A torn n->ha read can rewrite the skb Ethernet destination and reselect a different FDB remote, mis-encapsulating traffic to an unintended VXLAN peer and crossing intended multi-tenant overlay segmentation boundaries beyond the local VTEP authority.\nC:H - Unsynchronized reads of neighbour ha during concurrent updates yield torn MAC values that drive post-rewrite FDB lookup and encapsulation, potentially delivering other tenants' overlay frames to an attacker-controlled remote endpoint or leaking mixed neighbour state.\nI:H - The corrupted hardware address is copied into the skb Ethernet header and steers subsequent vxlan_find_mac_tx()/vxlan_xmit_one() encapsulation, enabling deterministic overlay traffic redirection or injection toward an attacker-chosen VTEP rather than the intended router destination.\nA:L - While the host kernel does not panic, torn MAC rewriting can cause mis-encapsulation, FDB misses, and dropped or misdelivered overlay packets, producing intermittent connectivity loss and performance degradation on affected VTEP nodes under sustained attack."
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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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"drivers/net/vxlan/vxlan_core.c"
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],
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"versions": [
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{
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"version": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "32a9590a8d30426e3db63e6b20893e47e02576c0",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "d0993fc053f29e15cc7c9fe2029df3882a2ab5ab",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "87210054bad82bbae6f483a742dc45722fb47a6b",
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"status": "affected",
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{
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"version": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "ec341bb76d77b4c2948764375ee6bfeef4bb41c3",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "ff89415d34c3ab9f5312316423122e664ed3524f",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "05f2987f73daa05333fd713d05546142f9f7c5f0",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d",
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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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"drivers/net/vxlan/vxlan_core.c"
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],
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"versions": [
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{
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"version": "3.8",
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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": "3.8",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.151",
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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": "6.12.103",
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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": "6.18.44",
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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": "7.1.8",
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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": "3.8",
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"versionEndExcluding": "5.10.265"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/32a9590a8d30426e3db63e6b20893e47e02576c0"
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},
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{
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"url": "https://git.kernel.org/stable/c/d0993fc053f29e15cc7c9fe2029df3882a2ab5ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/87210054bad82bbae6f483a742dc45722fb47a6b"
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},
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{
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"url": "https://git.kernel.org/stable/c/d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec341bb76d77b4c2948764375ee6bfeef4bb41c3"
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},
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{
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"url": "https://git.kernel.org/stable/c/ff89415d34c3ab9f5312316423122e664ed3524f"
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},
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{
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"url": "https://git.kernel.org/stable/c/05f2987f73daa05333fd713d05546142f9f7c5f0"
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},
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{
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"url": "https://git.kernel.org/stable/c/8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d"
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}
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],
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"title": "vxlan: use neigh_ha_snapshot() in route_shortcircuit()",
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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-2026-74475",
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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": "2026-10-16T18:57:29.550730Z"
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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": "2026-10-16T19:05:48.322Z"
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}
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}
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]
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}
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} |