CVE-2026-45782 (GCVE-0-2026-45782)

Vulnerability from cvelistv5 – Published: 2026-06-09 22:53 – Updated: 2026-06-10 16:32
VLAI
Title
Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion
Summary
Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0.
Severity
8.9 (High)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
cloud-hypervisor cloud-hypervisor Affected: >= 21.0, < 51.2
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45782",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T15:58:34.973878Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-10T16:32:33.406Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "cloud-hypervisor",
          "vendor": "cloud-hypervisor",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 21.0, \u003c 51.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 8.9,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416: Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T22:53:52.657Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh"
        },
        {
          "name": "https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220"
        },
        {
          "name": "https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa"
        },
        {
          "name": "https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2"
        },
        {
          "name": "https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0"
        }
      ],
      "source": {
        "advisory": "GHSA-f47p-p25q-83rh",
        "discovery": "UNKNOWN"
      },
      "title": "Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45782",
    "datePublished": "2026-06-09T22:53:52.657Z",
    "dateReserved": "2026-05-13T07:45:21.252Z",
    "dateUpdated": "2026-06-10T16:32:33.406Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45782",
      "date": "2026-08-11",
      "epss": "0.00138",
      "percentile": "0.03608"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45782\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-06-10T00:16:53.267\",\"lastModified\":\"2026-07-23T09:10:00.113\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0.\"},{\"lang\":\"es\",\"value\":\"Cloud Hypervisor es un Monitor de M\u00e1quina Virtual para cargas de trabajo en la nube. Desde la versi\u00f3n 21.0 hasta antes de la versi\u00f3n 51.2, un invitado puede causar un uso despu\u00e9s de liberaci\u00f3n en el proceso de cloud-hypervisor al enviar dos cadenas de descriptores virtio-block que reutilizan el mismo head_index mientras la E/S de bloque as\u00edncrona est\u00e1 habilitada (p. ej., io_uring, aio). Cuando el kernel completa la operaci\u00f3n duplicada antes que la original, la ruta de finalizaci\u00f3n libera un b\u00fafer de rebote del que el kernel todav\u00eda est\u00e1 leyendo o escribiendo activamente, corrompiendo la memoria liberada. Este problema ha sido parcheado en las versiones 51.2 y 52.0.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"cloud-hypervisor\",\"product\":\"cloud-hypervisor\",\"versions\":[{\"version\":\"\u003e= 21.0, \u003c 51.2\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.9,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"HIGH\",\"subIntegrityImpact\":\"HIGH\",\"subAvailabilityImpact\":\"HIGH\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T15:58:34.973878Z\",\"id\":\"CVE-2026-45782\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"references\":[{\"url\":\"https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh\",\"source\":\"security-advisories@github.com\"}]}}",
    "redhat_vex": {
      "current_release_date": "2026-06-11T02:59:10+00:00",
      "cve": "CVE-2026-45782",
      "id": "CVE-2026-45782",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45782.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-45782\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T15:58:34.973878Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-10T16:02:10.071Z\"}}], \"cna\": {\"title\": \"Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion\", \"source\": {\"advisory\": \"GHSA-f47p-p25q-83rh\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.9, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"HIGH\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"HIGH\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"cloud-hypervisor\", \"product\": \"cloud-hypervisor\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 21.0, \u003c 51.2\"}]}], \"references\": [{\"url\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh\", \"name\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220\", \"name\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa\", \"name\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2\", \"name\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0\", \"name\": \"https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416: Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-06-09T22:53:52.657Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-45782\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-10T16:32:33.406Z\", \"dateReserved\": \"2026-05-13T07:45:21.252Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-06-09T22:53:52.657Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.