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CVE-2015-2756 (GCVE-0-2015-2756)

Vulnerability from cvelistv5 – Published: 2015-04-01 14:00 – Updated: 2024-08-06 05:24
VLAI
Summary
QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
Severity
No CVSS data available.
CWE
  • n/a
Assigner
References
URL Tags
http://www.securityfocus.com/bid/72577 vdb-entryx_refsource_BID
https://security.gentoo.org/glsa/201504-04 vendor-advisoryx_refsource_GENTOO
https://support.citrix.com/article/CTX206006 x_refsource_CONFIRM
http://www.debian.org/security/2015/dsa-3259 vendor-advisoryx_refsource_DEBIAN
http://lists.fedoraproject.org/pipermail/package-… vendor-advisoryx_refsource_FEDORA
http://lists.fedoraproject.org/pipermail/package-… vendor-advisoryx_refsource_FEDORA
http://support.citrix.com/article/CTX201145 x_refsource_CONFIRM
http://lists.nongnu.org/archive/html/qemu-devel/2… mailing-listx_refsource_MLIST
http://xenbits.xen.org/xsa/advisory-126.html x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://www.ubuntu.com/usn/USN-2608-1 vendor-advisoryx_refsource_UBUNTU
http://www.securitytracker.com/id/1031998 vdb-entryx_refsource_SECTRACK
http://lists.fedoraproject.org/pipermail/package-… vendor-advisoryx_refsource_FEDORA
Date Public
2015-03-31 00:00
Show details on NVD website
To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2015-2756\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2015-04-01T14:59:08.757\",\"lastModified\":\"2026-05-06T22:30:45.220\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.\"},{\"lang\":\"es\",\"value\":\"QEMU, utilizado en Xen 3.3.x hasta 4.5.x, no restringe correctamente el acceso a los registros de comandos PCI, lo que podr\u00eda permitir a usuarios locales invitados de HVM causar una denegaci\u00f3n de servicio (non-maskable interrupt (NMI) y ca\u00edda de anfitri\u00f3n) mediante la deshabilitaci\u00f3n de (1) la memoria o (2) la decodificaci\u00f3n I/O para un dispositivo PCI Express y posteriormente accediendo al dispositivo, lo que provoca una respuesta Unsupported Request (UR).\"}],\"metrics\":{\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:L/AC:L/Au:N/C:N/I:N/A:C\",\"baseScore\":4.9,\"accessVector\":\"LOCAL\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":3.9,\"impactScore\":6.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-264\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"16F59A04-14CF-49E2-9973-645477EA09DA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"BF948E6A-07BE-4C7D-8A98-002E89D35F4D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C0E23B94-1726-4F63-84BB-8D83FAB156D7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C76124AB-4E3D-4BE0-AAEA-7FC05868E2FB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1044792C-D544-457C-9391-4F3B5BAB978D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:4.4.1:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"A40F356B-4F5F-485D-A53A-8CE4629D6931\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"90CCECD0-C0F9-45A8-8699-64428637EBCA\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FF47C9F0-D8DA-4B55-89EB-9B2C9383ADB9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"56BDB5A0-0839-4A20-A003-B8CD56F48171\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*\",\"matchCriteriaId\":\"B6B7CAD7-9D4E-4FDB-88E3-1E583210A01F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*\",\"matchCriteriaId\":\"B5A6F2F3-4894-4392-8296-3B8DD2679084\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"49A63F39-30BE-443F-AF10-6245587D3359\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F38D3B7E-8429-473F-BB31-FC3583EE5A5B\"}]}]}],\"references\":[{\"url\":\"http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154574.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154579.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155198.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg06179.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://support.citrix.com/article/CTX201145\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.debian.org/security/2015/dsa-3259\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.securityfocus.com/bid/72577\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.securitytracker.com/id/1031998\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.ubuntu.com/usn/USN-2608-1\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://xenbits.xen.org/xsa/advisory-126.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Vendor 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Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/201504-04\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://support.citrix.com/article/CTX206006\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T12:20:16+00:00",
      "cve": "CVE-2015-2756",
      "id": "CVE-2015-2756",
      "initial_release_date": "2015-03-31T00:00:00+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "xen: unmediated PCI command register access in qemu (xsa126)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2015/cve-2015-2756.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-04T01:08:42Z",
      "cve": "CVE-2015-2756",
      "id": "CVE-2015-2756",
      "initial_release_date": "2023-02-15T05:20:16Z",
      "product_status:known_not_affected": "1",
      "product_status:recommended": "131",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2015-2756",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2015-2756.json",
      "version": "12"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.