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[email protected]CVE-2021-28706

HistoryNov 24, 2021 - 1:15 a.m.

CVE-2021-28706

2021-11-2401:15:08

CWE-770

[email protected]

web.nvd.nist.gov

cve-2021-28706

memory limit

hypercall

memory allocation

overflow

nvd

security vulnerability

7.8 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:N/I:N/A:C

8.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

8.3 High

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

65.8%

JSON

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.

Affected configurations

NVD

Node

xenxenRange3.2–4.12

Node

fedoraprojectfedoraMatch34

fedoraprojectfedoraMatch35

Node

debiandebian_linuxMatch11.0

CPENameOperatorVersion
xen:xenxenlt4.12

CPE	Name	Operator	Version
xen:xen	xen	lt	4.12

CNA Affected

[
  {
    "vendor": "Xen",
    "product": "xen",
    "versions": [
      {
        "version": "4.12.x",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "Xen",
    "product": "xen",
    "versions": [
      {
        "version": "unspecified",
        "lessThan": "4.12",
        "status": "unknown",
        "versionType": "custom"
      },
      {
        "version": "4.14.x",
        "status": "affected",
        "lessThan": "unspecified",
        "versionType": "custom"
      },
      {
        "version": "next of 4.15.x",
        "status": "unaffected",
        "lessThan": "unspecified",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "Xen",
    "product": "xen",
    "versions": [
      {
        "version": "xen-unstable",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "Xen",
    "product": "xen",
    "versions": [
      {
        "version": "4.13.x",
        "status": "affected"
      }
    ]
  }
]