gsd-2021-28706
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
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.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-28706",
"description": "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.",
"id": "GSD-2021-28706",
"references": [
"https://www.suse.com/security/cve/CVE-2021-28706.html",
"https://www.debian.org/security/2021/dsa-5017",
"https://linux.oracle.com/cve/CVE-2021-28706.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-28706"
],
"details": "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.",
"id": "GSD-2021-28706",
"modified": "2023-12-13T01:23:29.040189Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"CVE_data_meta": {
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"ID": "CVE-2021-28706",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "xen",
"version": {
"version_data": [
{
"version_value": "4.12.x"
}
]
}
},
{
"product_name": "xen",
"version": {
"version_data": [
{
"version_affected": "?\u003c",
"version_value": "4.12"
},
{
"version_affected": "\u003e=",
"version_value": "4.14.x"
},
{
"version_affected": "!\u003e",
"version_value": "4.15.x"
}
]
}
},
{
"product_name": "xen",
"version": {
"version_data": [
{
"version_value": "xen-unstable"
}
]
}
},
{
"product_name": "xen",
"version": {
"version_data": [
{
"version_value": "4.13.x"
}
]
}
}
]
},
"vendor_name": "Xen"
}
]
}
},
"configuration": {
"configuration_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "All Xen versions from at least 3.2 onwards are affected.\n\nOn x86, only Xen builds with the BIGMEM configuration option enabled are\naffected. (This option is off by default.)\n\nOnly hosts with more than 16 TiB of memory are affected."
}
]
}
}
},
"credit": {
"credit_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "This issue was discovered by Julien Grall of Amazon."
}
]
}
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"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."
}
]
},
"impact": {
"impact_data": {
"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."
}
]
}
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "unknown"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://xenbits.xenproject.org/xsa/advisory-385.txt",
"refsource": "MISC",
"url": "https://xenbits.xenproject.org/xsa/advisory-385.txt"
},
{
"name": "FEDORA-2021-03645e9807",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/"
},
{
"name": "DSA-5017",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2021/dsa-5017"
},
{
"name": "FEDORA-2021-2b3a2de94f",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/"
},
{
"name": "GLSA-202402-07",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/202402-07"
}
]
},
"workaround": {
"workaround_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "Setting the maximum amount of memory a guest may allocate to strictly\nless than 1023 GiB will avoid the vulnerability."
}
]
}
}
}
},
"nvd.nist.gov": {
"cve": {
"configurations": [
{
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"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."
},
{
"lang": "es",
"value": "Los hu\u00e9spedes pueden exceder su l\u00edmite de memoria designado Cuando a un hu\u00e9sped se le permite tener cerca de 16TiB de memoria, puede ser capaz de emitir hypercalls para aumentar su asignaci\u00f3n de memoria m\u00e1s all\u00e1 del l\u00edmite establecido por el administrador. Esto es el resultado de un c\u00e1lculo realizado con precisi\u00f3n de 32 bits, que puede desbordarse. En ese caso, s\u00f3lo el n\u00famero desbordado (y por tanto peque\u00f1o) se comparar\u00e1 con el l\u00edmite superior establecido"
}
],
"id": "CVE-2021-28706",
"lastModified": "2024-02-04T08:15:08.880",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.8,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 6.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
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"impactScore": 4.0,
"source": "nvd@nist.gov",
"type": "Primary"
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]
},
"published": "2021-11-24T01:15:08.127",
"references": [
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"source": "security@xen.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/"
},
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},
{
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"url": "https://security.gentoo.org/glsa/202402-07"
},
{
"source": "security@xen.org",
"tags": [
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],
"url": "https://www.debian.org/security/2021/dsa-5017"
},
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"tags": [
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],
"url": "https://xenbits.xenproject.org/xsa/advisory-385.txt"
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"sourceIdentifier": "security@xen.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
}
}
}
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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.
- 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.