310 lines
16 KiB
JSON
310 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-2026-68432",
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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": "2026-07-30T09:28:09.393Z",
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"datePublished": "2026-08-12T00:07:18.806Z",
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"dateUpdated": "2026-10-19T21:09:10.150Z"
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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": "2026-08-19T16:35:30.743Z"
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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: require CAP_NET_ADMIN in the device netns for changelink\n\nA tunnel changelink() operates on at most two netns, dev_net(dev) and\nthe sticky underlay netns vxlan->net. They differ once the device is\ncreated in or moved to a netns other than the one the request runs in.\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),\nso a caller privileged there but not in vxlan->net can rewrite a vxlan\ndevice whose underlay lives in vxlan->net.\n\nvxlan_changelink() validates and applies the new configuration against\nvxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the\nunderlay socket in that netns, so the same reasoning as the tunnel\nchangelink series applies here.\n\nGate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of\nthe op before any attribute is parsed, matching ipgre_changelink() and\nthe rest of the \"require CAP_NET_ADMIN in the device netns for\nchangelink\" series.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 - Exploitation requires issuing an RTM_NEWLINK changelink request over an rtnetlink socket on the local system, matching the kernel guidance that netlink configuration paths are Local.\nAC:L - Once a cross-namespace vxlan device is present in the caller's netns, the missing check is bypassed by a single deterministic netlink changelink call with no race, timing, or memory-layout dependency.\nPR:L - The rtnl entry path only requires CAP_NET_ADMIN in dev_net(dev), which an unprivileged user obtains inside a user namespace via unshare --user --map-root-user --net; no privilege in the underlay netns vxlan->net is needed.\nUI:N - The attack is fully programmatic through netlink from the attacker's own process; no victim action such as mounting, opening a file, or clicking is required.\nS:C - Authorization is evaluated against dev_net(dev) while the configuration is validated and applied against vxlan->net, so the impact crosses from the attacker's net/user namespace into another tenant's or the host's network namespace.\nC:H - The attacker can rewrite IFLA_VXLAN_GROUP/LOCAL and the underlay IFLA_VXLAN_LINK so encapsulated overlay traffic in the victim netns is sent to an attacker-controlled endpoint, exposing tunneled payloads.\nI:H - Unauthorized changelink mutates live tunnel state in the victim underlay netns (remote/local addresses, lower device, TOS/TTL/label, learning and proxy/RSC flags, default-remote FDB entries), enabling redirection and injection of overlay traffic.\nA:H - Rewriting the remote group, source address, or lower device tears down and re-establishes multicast group membership and forwarding state, causing sustained loss of connectivity for every service riding the affected VXLAN overlay."
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "b95a8743e58f7efed5ddc4cb73829b66f17feab0",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "7465ade989ba84adc2bfa58bad3ca25d249f0f7a",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "0aa580a8bbbed2507b4582a1f0ef581d480d06ed",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "b3793d7dccb192ffff29894d11824db6251acdd5",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "730c7e5fea7f06e0cdf21c547222ec93234fd1d6",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "e8ad0d311e225939a9a6c745d6cc384c7364ec87",
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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": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
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"lessThan": "3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e",
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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": "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": "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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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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": "7.1.6",
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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": "4.11",
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"versionEndExcluding": "5.10.265"
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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": "5.15.216"
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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": "6.1.183"
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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": "4.11",
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"versionEndExcluding": "6.6.148"
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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": "6.12.101"
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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": "6.18.42"
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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": "7.1.6"
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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": "7.2"
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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/b95a8743e58f7efed5ddc4cb73829b66f17feab0"
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},
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{
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"url": "https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a"
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},
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{
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"url": "https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5"
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},
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{
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"url": "https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f"
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},
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{
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"url": "https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87"
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},
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{
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"url": "https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e"
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}
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],
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"title": "vxlan: require CAP_NET_ADMIN in the device netns for changelink",
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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-2026-68432",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:48:52.480523Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-863",
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"description": "CWE-863 Incorrect Authorization"
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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": "2026-10-19T21:09:10.150Z"
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}
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}
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]
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}
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} |