CVE-2021-28706 (GCVE-0-2021-28706)
Vulnerability from cvelistv5 – Published: 2021-11-24 00:00 – Updated: 2024-08-03 21:47
VLAI?
Summary
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
Severity ?
No CVSS data available.
CWE
- unknown
Assigner
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Impacted products
Credits
{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Julien Grall of Amazon.'}]}}}
{
"containers": {
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"providerMetadata": {
"dateUpdated": "2024-08-03T21:47:33.187Z",
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"shortName": "CVE"
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"references": [
{
"tags": [
"x_transferred"
],
"url": "https://xenbits.xenproject.org/xsa/advisory-385.txt"
},
{
"name": "FEDORA-2021-03645e9807",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/"
},
{
"name": "DSA-5017",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://www.debian.org/security/2021/dsa-5017"
},
{
"name": "FEDORA-2021-2b3a2de94f",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/"
},
{
"name": "GLSA-202402-07",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/202402-07"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "xen",
"vendor": "Xen",
"versions": [
{
"status": "affected",
"version": "4.12.x"
}
]
},
{
"product": "xen",
"vendor": "Xen",
"versions": [
{
"lessThan": "4.12",
"status": "unknown",
"version": "unspecified",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "affected",
"version": "4.14.x",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "next of 4.15.x",
"versionType": "custom"
}
]
},
{
"product": "xen",
"vendor": "Xen",
"versions": [
{
"status": "affected",
"version": "xen-unstable"
}
]
},
{
"product": "xen",
"vendor": "Xen",
"versions": [
{
"status": "affected",
"version": "4.13.x"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "{\u0027credit_data\u0027: {\u0027description\u0027: {\u0027description_data\u0027: [{\u0027lang\u0027: \u0027eng\u0027, \u0027value\u0027: \u0027This issue was discovered by Julien Grall of Amazon.\u0027}]}}}"
}
],
"descriptions": [
{
"lang": "en",
"value": "guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound."
}
],
"metrics": [
{
"other": {
"content": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "A guest may be able too allocate unbounded amounts of memory to itself.\nThis may result in a Denial of Service (DoS) affecting the entire host."
}
]
}
},
"type": "unknown"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "unknown",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-02-04T08:06:49.398Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-385.txt"
},
{
"name": "FEDORA-2021-03645e9807",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/"
},
{
"name": "DSA-5017",
"tags": [
"vendor-advisory"
],
"url": "https://www.debian.org/security/2021/dsa-5017"
},
{
"name": "FEDORA-2021-2b3a2de94f",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/"
},
{
"name": "GLSA-202402-07",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202402-07"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2021-28706",
"datePublished": "2021-11-24T00:00:00.000Z",
"dateReserved": "2021-03-18T00:00:00.000Z",
"dateUpdated": "2024-08-03T21:47:33.187Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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