248 lines
12 KiB
JSON
248 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-2021-47109",
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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": "2024-03-04T18:12:48.836Z",
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"datePublished": "2024-03-15T20:14:18.469Z",
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"dateUpdated": "2026-08-05T08:46:03.543Z"
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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": "2026-08-05T08:46:03.543Z"
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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\nneighbour: allow NUD_NOARP entries to be forced GCed\n\nIFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to\nfill up the neighbour table with enough entries that it will overflow for\nvalid connections after that.\n\nThis behaviour is more prevalent after commit 58956317c8de (\"neighbor:\nImprove garbage collection\") is applied, as it prevents removal from\nentries that are not NUD_FAILED, unless they are more than 5s old."
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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:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - A remote attacker can elicit replies to many unique IPv6 sources that egress via a POINTOPOINT/NOARP device (e.g. WireGuard, sit), and ip6_finish_output2 creates a NUD_NOARP neighbour per destination over the Internet path.\nAC:L - The attacker reliably fills the table by sending traffic from many distinct IPv6 addresses; no race, rare config, or other condition outside attacker control is required on a host with IPv6 via such an interface.\nPR:N - Exploitation needs only unauthenticated network packets that cause the victim to send replies; no local account or capabilities are required.\nUI:N - No victim action is needed; inbound packets alone drive neighbour creation and table exhaustion.\nS:U - Impact stays within the host kernel networking authority; there is no VM escape, sandbox escape, or other security-boundary crossing.\nC:N - This is resource exhaustion only—failed neigh_alloc returns ENOBUFS with no memory disclosure or read primitive.\nI:N - There is no memory corruption or attacker-controlled write; only allocation failure and dropped/failed neighbour resolution.\nA:H - Overflowing the neighbour table prevents new legitimate neighbour entries, sustaining denial of network connectivity for the host (confirmed in a real server DoS)."
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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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"net/core/neighbour.c"
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],
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"versions": [
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{
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"version": "58956317c8de52009d1a38a721474c24aef74fe7",
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"lessThan": "d99029e6aab62aef0a0251588b2867e77e83b137",
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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": "58956317c8de52009d1a38a721474c24aef74fe7",
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"lessThan": "d17d47da59f726dc4c87caebda3a50333d7e2fd3",
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"status": "affected",
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},
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{
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"version": "58956317c8de52009d1a38a721474c24aef74fe7",
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"lessThan": "ddf088d7aaaaacfc836104f2e632b29b1d383cfc",
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"status": "affected",
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"lessThan": "7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f",
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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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"net/core/neighbour.c"
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],
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"versions": [
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{
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"version": "5.0",
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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": "5.0",
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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": "5.4.125",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.43",
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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": "5.12.10",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.0",
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"versionEndExcluding": "5.4.125"
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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": "5.0",
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"references": [
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"url": "https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137"
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"url": "https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f"
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}
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],
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"title": "neighbour: allow NUD_NOARP entries to be forced GCed",
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"title": "CISA ADP Vulnrichment",
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-47109",
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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": "partial"
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"version": "2.0.3",
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"timestamp": "2024-03-19T15:24:45.992487Z"
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