Vulnerability-Lookup

CVE-2026-0665 (GCVE-0-2026-0665)

Vulnerability from cvelistv5 – Published: 2026-02-18 20:50 – Updated: 2026-02-18 21:27

Title

Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq

Summary

An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption.

Severity ?

6.5 (Medium)


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

CWE

CWE-787 - Out-of-bounds Write

Assigner

fedora

References

URL

Tags

	https://access.redhat.com/security/cve/CVE-2026-0665	vdb-entryx_refsource_REDHAT
	https://bugzilla.redhat.com/show_bug.cgi?id=2428640	issue-trackingx_refsource_REDHAT

Impacted products

Vendor

Product

Version

Affected: 8.0.0 , ≤ 10.2.0 (semver)

Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Show details on NVD website

JSON

To clipboard

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GHSA-4PQ4-6GR5-CR69

Vulnerability from github – Published: 2026-02-18 21:31 – Updated: 2026-02-18 21:31

Details

Severity ?

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-0665"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-18T21:16:22Z",
    "severity": "MODERATE"
  },
  "details": "An off-by-one error was found in QEMU\u0027s KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption.",
  "id": "GHSA-4pq4-6gr5-cr69",
  "modified": "2026-02-18T21:31:23Z",
  "published": "2026-02-18T21:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0665"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-0665"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2428640"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

FKIE_CVE-2026-0665

Vulnerability from fkie_nvd - Published: 2026-02-18 21:16 - Updated: 2026-02-19 15:53

Severity ?

6.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Summary

References

	URL	Tags
	patrick@puiterwijk.org	https://access.redhat.com/security/cve/CVE-2026-0665
	patrick@puiterwijk.org	https://bugzilla.redhat.com/show_bug.cgi?id=2428640

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An off-by-one error was found in QEMU\u0027s KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 un error \u0027off-by-one\u0027 (desbordamiento por un elemento) en el soporte de QEMU para invitados KVM Xen. Un invitado malicioso podr\u00eda aprovechar este fallo para desencadenar accesos fuera de l\u00edmite a la pila en el proceso de QEMU a trav\u00e9s de la interfaz de hiperllamada physdev de Xen emulada, lo que llevar\u00eda a una denegaci\u00f3n de servicio o a una posible corrupci\u00f3n de memoria."
    }
  ],
  "id": "CVE-2026-0665",
  "lastModified": "2026-02-19T15:53:02.850",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 4.0,
        "source": "patrick@puiterwijk.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-18T21:16:22.633",
  "references": [
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      "source": "patrick@puiterwijk.org",
      "url": "https://access.redhat.com/security/cve/CVE-2026-0665"
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  "sourceIdentifier": "patrick@puiterwijk.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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        }
      ],
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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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-0665 (GCVE-0-2026-0665)

GHSA-4PQ4-6GR5-CR69

FKIE_CVE-2026-0665

Tags

Sightings

Nomenclature