Vulnerability-Lookup

OESA-2026-2527 (CVE-2026-47243)

Vulnerability from osv_openeuler – Published: 2026-05-29 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

kata-containers security update

Details

This is core component of Kata Container, to make it work, you need a isulad/docker engine.

Security Fix(es):

'This vulnerability was fixed in Kata Containers 3.31.0:', 'Description:\n\nIn the runtime-rs standalone virtio-fs path, Kata Containers runs virtiofsd\nas root with --sandbox none --seccomp none.\n\nIf an attacker has root-equivalent execution inside the Kata guest VM,\nthey can send raw FUSE requests directly to the host virtiofsd.\n\nThen, a raw FUSE_SYMLINK request whose new symlink name is\nan absolute host path is honored outside the virtio-fs shared directory.\n\nThis lets guest root create host-root-owned symlinks in sensitive host paths.\n\nCVE: CVE-2026-47243\nGHSA: GHSA-2gv2-cffp-j227\n\nOriginal report:', '---\nAurelien Bombo\nKata Containers Vulnerability Management Team'

Severity

7.2 (High)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-47243	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "kata-containers-3.2.0-22.oe2403sp1.aarch64.rpm"
        ],
        "src": [
          "kata-containers-3.2.0-22.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "kata-containers-3.2.0-22.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "kata-containers",
        "purl": "pkg:rpm/openEuler/kata-containers\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.0-22.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "This is core component of Kata Container, to make it work, you need a isulad/docker engine.\r\n\r\nSecurity Fix(es):\n\n[\u0026apos;This vulnerability was fixed in Kata Containers 3.31.0:\u0026apos;, \u0026apos;Description:\\n\\nIn the runtime-rs standalone virtio-fs path, Kata Containers runs virtiofsd\\nas root with --sandbox none --seccomp none.\\n\\nIf an attacker has root-equivalent execution inside the Kata guest VM,\\nthey can send raw FUSE requests directly to the host virtiofsd.\\n\\nThen, a raw FUSE_SYMLINK request whose new symlink name is\\nan absolute host path is honored outside the virtio-fs shared directory.\\n\\nThis lets guest root create host-root-owned symlinks in sensitive host paths.\\n\\nCVE: CVE-2026-47243\\nGHSA: GHSA-2gv2-cffp-j227\\n\\nOriginal report:\u0026apos;, \u0026apos;---\\nAurelien Bombo\\nKata Containers Vulnerability Management Team\u0026apos;](CVE-2026-47243)",
  "id": "OESA-2026-2527",
  "modified": "2026-08-06T11:11:28Z",
  "published": "2026-05-29T11:11:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2527"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47243"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kata-containers security update",
  "upstream": [
    "CVE-2026-47243"
  ]
}

CVE-2026-47243 (GCVE-0-2026-47243)

Vulnerability from cvelistv5 – Published: 2026-08-07 21:36 – Updated: 2026-08-10 13:34

Title

Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs

Summary

Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. Prior to 3.31.0, the runtime-rs standalone virtio-fs path is vulnerable to a guest-root to host-root escape. In this configuration, Kata runs the host virtiofsd as root with --sandbox none --seccomp none, so an attacker with root-equivalent access inside the guest can bypass the guest virtio-fs client entirely by taking over the virtio-fs PCI device and building a virtqueue in userspace to submit raw FUSE requests directly to the host virtiofsd. A crafted FUSE_SYMLINK request whose new symlink name is an absolute host path is honored outside the configured shared directory, allowing guest root to create root-owned symlinks in sensitive host locations such as /etc/cron.d. By pointing such a symlink at a guest-controlled crontab payload reachable through a live runtime process's mount namespace, the attacker causes the host cron daemon to execute that payload as host root, crossing the Kata isolation boundary. This issue is fixed in version 3.31.0.

Severity

9.2 (Critical)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-10 13:33 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-36 - Absolute Path Traversal

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/kata-containers/kata-container…	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
kata-containers	kata-containers	Affected: < 3.31.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-08-07T22:17:12.604Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/21/14"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-47243",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-10T13:33:45.456561Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-10T13:34:09.469Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-2gv2-cffp-j227"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "kata-containers",
          "vendor": "kata-containers",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.31.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. Prior to 3.31.0, the runtime-rs standalone virtio-fs path is vulnerable to a guest-root to host-root escape. In this configuration, Kata runs the host virtiofsd as root with --sandbox none --seccomp none, so an attacker with root-equivalent access inside the guest can bypass the guest virtio-fs client entirely by taking over the virtio-fs PCI device and building a virtqueue in userspace to submit raw FUSE requests directly to the host virtiofsd. A crafted FUSE_SYMLINK request whose new symlink name is an absolute host path is honored outside the configured shared directory, allowing guest root to create root-owned symlinks in sensitive host locations such as /etc/cron.d. By pointing such a symlink at a guest-controlled crontab payload reachable through a live runtime process\u0027s mount namespace, the attacker causes the host cron daemon to execute that payload as host root, crossing the Kata isolation boundary. This issue is fixed in version 3.31.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "HIGH",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-36",
              "description": "CWE-36: Absolute Path Traversal",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-07T21:36:49.979Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-2gv2-cffp-j227",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-2gv2-cffp-j227"
        }
      ],
      "source": {
        "advisory": "GHSA-2gv2-cffp-j227",
        "discovery": "UNKNOWN"
      },
      "title": "Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-47243",
    "datePublished": "2026-08-07T21:36:49.979Z",
    "dateReserved": "2026-05-18T22:54:18.272Z",
    "dateUpdated": "2026-08-10T13:34:09.469Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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OESA-2026-2527 (CVE-2026-47243)

CVE-2026-47243 (GCVE-0-2026-47243)

Tags

Sightings

Nomenclature

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