CVE-2021-47109 (GCVE-0-2021-47109)
Vulnerability from cvelistv5
Published
2024-03-15 20:14
Modified
2025-05-04 07:04
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
neighbour: allow NUD_NOARP entries to be forced GCed
IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to
fill up the neighbour table with enough entries that it will overflow for
valid connections after that.
This behaviour is more prevalent after commit 58956317c8de ("neighbor:
Improve garbage collection") is applied, as it prevents removal from
entries that are not NUD_FAILED, unless they are more than 5s old.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-47109",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-03-19T15:24:45.992487Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-06-04T17:14:40.388Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-04T05:24:39.847Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/neighbour.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d99029e6aab62aef0a0251588b2867e77e83b137",
"status": "affected",
"version": "58956317c8de52009d1a38a721474c24aef74fe7",
"versionType": "git"
},
{
"lessThan": "d17d47da59f726dc4c87caebda3a50333d7e2fd3",
"status": "affected",
"version": "58956317c8de52009d1a38a721474c24aef74fe7",
"versionType": "git"
},
{
"lessThan": "ddf088d7aaaaacfc836104f2e632b29b1d383cfc",
"status": "affected",
"version": "58956317c8de52009d1a38a721474c24aef74fe7",
"versionType": "git"
},
{
"lessThan": "7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f",
"status": "affected",
"version": "58956317c8de52009d1a38a721474c24aef74fe7",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/neighbour.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.0"
},
{
"lessThan": "5.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.125",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.43",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.125",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.43",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.10",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13",
"versionStartIncluding": "5.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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\u0027s 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."
}
],
"providerMetadata": {
"dateUpdated": "2025-05-04T07:04:21.104Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137"
},
{
"url": "https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3"
},
{
"url": "https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc"
},
{
"url": "https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f"
}
],
"title": "neighbour: allow NUD_NOARP entries to be forced GCed",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47109",
"datePublished": "2024-03-15T20:14:18.469Z",
"dateReserved": "2024-03-04T18:12:48.836Z",
"dateUpdated": "2025-05-04T07:04:21.104Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:39.847Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47109\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-19T15:24:45.992487Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:18.770Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"neighbour: allow NUD_NOARP entries to be forced GCed\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"58956317c8de52009d1a38a721474c24aef74fe7\", \"lessThan\": \"d99029e6aab62aef0a0251588b2867e77e83b137\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"58956317c8de52009d1a38a721474c24aef74fe7\", \"lessThan\": \"d17d47da59f726dc4c87caebda3a50333d7e2fd3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"58956317c8de52009d1a38a721474c24aef74fe7\", \"lessThan\": \"ddf088d7aaaaacfc836104f2e632b29b1d383cfc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"58956317c8de52009d1a38a721474c24aef74fe7\", \"lessThan\": \"7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/neighbour.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.125\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.43\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/neighbour.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137\"}, {\"url\": \"https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3\"}, {\"url\": \"https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc\"}, {\"url\": \"https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"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\u0027s 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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:35:24.735Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47109\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:35:24.735Z\", \"dateReserved\": \"2024-03-04T18:12:48.836Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-15T20:14:18.469Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…