Vulnerability-Lookup

CVE-2026-62425 (GCVE-0-2026-62425)

Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:40

Title

buffer overruns in libfsimage iso9660 handling

Summary

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them: * The directory loop itself assumes a good record length. This is CVE-2026-42494. * The calculation of the System Use area may underflow. This is CVE-2026-42495. * The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423. * The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424. * The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-20 - Improper Input Validation

Assigner

XEN

References

1 reference

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-497.html

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-497

Date Public

2026-07-28 12:00

Credits

This issue was discovered by Syed Abdul Khaliq of BugQore.

Show details on NVD website

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-62425",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-28T15:40:12.638109Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-20",
                "description": "CWE-20 Improper Input Validation",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-28T15:40:37.904Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-497"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "All Xen versions from at least 3.2 onwards are affected.  Older versions\nhave not been inspected."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
        }
      ],
      "datePublic": "2026-07-28T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length.  This is\n   CVE-2026-42494.\n\n * The calculation of the System Use area may underflow.  This is\n   CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n   This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n   This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n   This is CVE-2026-62425."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-28T12:31:41.918Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
        }
      ],
      "title": "buffer overruns in libfsimage iso9660 handling",
      "workarounds": [
        {
          "lang": "en",
          "value": "XSA-443 added a mechanism to run pygrub de-privileged.  Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2026-62425",
    "datePublished": "2026-07-28T12:31:41.918Z",
    "dateReserved": "2026-07-14T10:28:12.654Z",
    "dateUpdated": "2026-07-28T15:40:37.904Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-62425\",\"sourceIdentifier\":\"security@xen.org\",\"published\":\"2026-07-28T13:19:01.410\",\"lastModified\":\"2026-07-28T16:19:31.710\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"[This CNA information record relates to multiple CVEs; the\\ntext explains which aspects/vulnerabilities correspond to which CVE.]\\n\\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\\nderives several lengths directly from attacker-controlled on-disk fields\\nwithout validating them:\\n\\n * The directory loop itself assumes a good record length.  This is\\n   CVE-2026-42494.\\n\\n * The calculation of the System Use area may underflow.  This is\\n   CVE-2026-42495.\\n\\n * The Rock Ridge extension loop assumes a good (inner) record length.\\n   This is CVE-2026-62423.\\n\\n * The Rock Ridge NM record processing assumes a good entry length.\\n   This is CVE-2026-62424.\\n\\n * The Rock Ridge CE record processing assumes a good size and offset.\\n   This is CVE-2026-62425.\"}],\"affected\":[{\"source\":\"security@xen.org\",\"affectedData\":[{\"vendor\":\"Xen\",\"product\":\"Xen\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"consult Xen advisory XSA-497\",\"status\":\"unknown\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-28T15:40:12.638109Z\",\"id\":\"CVE-2026-62425\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"}]}],\"references\":[{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-497.html\",\"source\":\"security@xen.org\"}]}}",
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-28T17:10:04Z",
      "cve": "CVE-2026-62425",
      "id": "CVE-2026-62425",
      "initial_release_date": "2026-07-28T17:10:04Z",
      "product_status:first_fixed": "87",
      "product_status:known_affected": "151",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-62425",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-62425.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-62425\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-28T15:40:12.638109Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-28T15:39:58.133Z\"}}], \"cna\": {\"title\": \"buffer overruns in libfsimage iso9660 handling\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was discovered by Syed Abdul Khaliq of BugQore.\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"A guest using pygrub can escalate its privilege to that of the domain\\nconstruction tools (i.e., normally, to control of the host).\\n\\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\\nis in use, then the guest can only escalate to this limited context.\"}]}], \"affected\": [{\"vendor\": \"Xen\", \"product\": \"Xen\", \"versions\": [{\"status\": \"unknown\", \"version\": \"consult Xen advisory XSA-497\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2026-07-28T12:00:00.000Z\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-497.html\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"XSA-443 added a mechanism to run pygrub de-privileged.  Using this mode\\nwill mitigate the vulnerability.\\n\\nEnsuring that guests do not use the pygrub bootloader will avoid this\\nvulnerability.\\n\\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\\nbootloader, pvgrub is a suitable alternative to pygrub.\\n\\nRunning only HVM or PVH guests will avoid the vulnerability.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"[This CNA information record relates to multiple CVEs; the\\ntext explains which aspects/vulnerabilities correspond to which CVE.]\\n\\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\\nderives several lengths directly from attacker-controlled on-disk fields\\nwithout validating them:\\n\\n * The directory loop itself assumes a good record length.  This is\\n   CVE-2026-42494.\\n\\n * The calculation of the System Use area may underflow.  This is\\n   CVE-2026-42495.\\n\\n * The Rock Ridge extension loop assumes a good (inner) record length.\\n   This is CVE-2026-62423.\\n\\n * The Rock Ridge NM record processing assumes a good entry length.\\n   This is CVE-2026-62424.\\n\\n * The Rock Ridge CE record processing assumes a good size and offset.\\n   This is CVE-2026-62425.\"}], \"configurations\": [{\"lang\": \"en\", \"value\": \"All Xen versions from at least 3.2 onwards are affected.  Older versions\\nhave not been inspected.\"}], \"providerMetadata\": {\"orgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"shortName\": \"XEN\", \"dateUpdated\": \"2026-07-28T12:31:41.918Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-62425\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-28T15:40:37.904Z\", \"dateReserved\": \"2026-07-14T10:28:12.654Z\", \"assignerOrgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"datePublished\": \"2026-07-28T12:31:41.918Z\", \"assignerShortName\": \"XEN\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

GHSA-R2QC-JVXX-R42Q

Vulnerability from github – Published: 2026-07-28 15:32 – Updated: 2026-07-28 18:33

Details

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them:

The directory loop itself assumes a good record length. This is CVE-2026-42494.
The calculation of the System Use area may underflow. This is CVE-2026-42495.
The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423.
The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424.
The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.

Severity

5.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-62425"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-28T13:19:01Z",
    "severity": "MODERATE"
  },
  "details": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length.  This is\n   CVE-2026-42494.\n\n * The calculation of the System Use area may underflow.  This is\n   CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n   This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n   This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n   This is CVE-2026-62425.",
  "id": "GHSA-r2qc-jvxx-r42q",
  "modified": "2026-07-28T18:33:01Z",
  "published": "2026-07-28T15:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62425"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-62425 (GCVE-0-2026-62425)

GHSA-R2QC-JVXX-R42Q

Tags

Sightings

Nomenclature