CVE-2020-27675 (GCVE-0-2020-27675)

Vulnerability from cvelistv5 – Published: 2020-10-22 20:32 – Updated: 2024-08-04 16:18
VLAI
Summary
An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2266 records in the last 180 days details
References
Show details on NVD website
To clipboard 

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          "url": "https://xenbits.xen.org/xsa/advisory-331.html"
        }
      ],
      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-362"
            },
            {
              "lang": "en",
              "value": "CWE-416"
            },
            {
              "lang": "en",
              "value": "CWE-476"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "microsoft_vex": {
      "current_release_date": "2020-11-04T00:00:00.000Z",
      "cve": "CVE-2020-27675",
      "id": "msrc_CVE-2020-27675",
      "initial_release_date": "2020-10-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "An issue was discovered in the Linux kernel through 5.9.1 as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device aka CID-073d0552ead5.",
      "url": "https://msrc.microsoft.com/csaf/vex/2020/msrc_cve-2020-27675.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
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                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "C7E1EBA7-1B6D-4A6D-ADFF-2B556573F073",
                    "versionEndIncluding": "5.9.1",
                    "vulnerable": true
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5."
          },
          {
            "lang": "es",
            "value": "Se detect\u00f3 un problema en el kernel de Linux versiones hasta 5.9.1, como es usado con Xen versiones hasta 4.14.x.\u0026#xa0;El archivo drivers/xen/events/events_base.c permite la eliminaci\u00f3n del canal de eventos durante el ciclo de manejo de eventos (una condici\u00f3n de carrera).\u0026#xa0;Esto puede causar una desreferencia del puntero NULL y un uso de la memoria previamente liberada como es demostrado por un bloqueo dom0 por medio de eventos para un dispositivo paravirtualizado en reconfiguraci\u00f3n, tambi\u00e9n se conoce como CID-073d0552ead5"
          }
        ],
        "id": "CVE-2020-27675",
        "lastModified": "2024-11-21T05:21:38.707",
        "metrics": {
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              "baseSeverity": "MEDIUM",
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                "accessVector": "LOCAL",
                "authentication": "NONE",
                "availabilityImpact": "COMPLETE",
                "baseScore": 4.7,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:L/AC:M/Au:N/C:N/I:N/A:C",
                "version": "2.0"
              },
              "exploitabilityScore": 3.4,
              "impactScore": 6.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
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            }
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2020-10-22T21:15:14.153",
        "references": [
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            "tags": [
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            "url": "http://www.openwall.com/lists/oss-security/2021/01/19/3"
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        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              },
              {
                "lang": "en",
                "value": "CWE-416"
              },
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T05:24:19+00:00",
      "cve": "CVE-2020-27675",
      "id": "CVE-2020-27675",
      "initial_release_date": "2020-10-20T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "103",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xen: race condition in event-channel removal during the event-handling loop (XSA-331)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-27675.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T01:45:30Z",
      "cve": "CVE-2020-27675",
      "id": "CVE-2020-27675",
      "initial_release_date": "2023-02-15T03:52:38Z",
      "product_status:known_affected": "439",
      "product_status:known_not_affected": "25",
      "product_status:recommended": "954",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-27675",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2023/cve-2020-27675.json",
      "version": "37"
    }
  }
}



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Sightings

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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.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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