CVE-2026-62434 (GCVE-0-2026-62434)

Vulnerability from cvelistv5 – Published: 2026-07-28 12:33 – Updated: 2026-07-28 16:33
VLAI
Title
PoD: Don't try to reclaim special pages
Summary
A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest RAM. This can cause corruption of memory management state in Xen.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 14:59 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Xen Xen Unknown: consult Xen advisory XSA-507
guessed Create a notification for this product.
Date Public
2026-07-28 12:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-28T16:33:34.668Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://xenbits.xen.org/xsa/advisory-507.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/28/23"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-62434",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-28T14:59:52.970334Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-28T15:00:00.728Z",
          "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-507"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "All Xen versions from 3.4 onwards are vulnerable.  Xen versions 3.3 and\nearlier are not vulnerable.\n\nOnly x86 systems are vulnerable.\n\nOnly x86 HVM and PVH guests started in populate-on-demand mode are\nbelieved to be able to leverage the vulnerability.  Populate-on-demand\nmode is activated when the guest\u0027s xl configuration file specifies a\n\"maxmem\" value which is larger than the \"memory\" value."
        }
      ],
      "datePublic": "2026-07-28T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A guest started with Populated on Demand enabled (PoD) can attempt to\nreclaim pages which aren\u0027t regular guest RAM.  This can cause corruption\nof memory management state in Xen."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A buggy or malicious guest can cause corruption of Xen\u0027s state, leading\nto crashes or other malfunctions.  Information leak and privilege\nescalation cannot be ruled out."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-28T12:33:08.540Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-507.html"
        }
      ],
      "title": "PoD: Don\u0027t try to reclaim special pages",
      "workarounds": [
        {
          "lang": "en",
          "value": "Running only PV guests or HVM/PVH guests without PoD will avoid the\nvulnerability."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2026-62434",
    "datePublished": "2026-07-28T12:33:08.540Z",
    "dateReserved": "2026-07-14T10:28:12.655Z",
    "dateUpdated": "2026-07-28T16:33:34.668Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-62434",
      "date": "2026-10-01",
      "epss": "0.00507",
      "percentile": "0.41009"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unknown",
                "product": "Xen",
                "vendor": "Xen",
                "versions": [
                  {
                    "status": "unknown",
                    "version": "consult Xen advisory XSA-507"
                  }
                ]
              }
            ],
            "source": "security@xen.org"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "A guest started with Populated on Demand enabled (PoD) can attempt to\nreclaim pages which aren\u0027t regular guest RAM.  This can cause corruption\nof memory management state in Xen."
          }
        ],
        "id": "CVE-2026-62434",
        "lastModified": "2026-07-28T17:16:58.200",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-62434",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-28T14:59:52.970334Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-28T13:19:02.317",
        "references": [
          {
            "source": "security@xen.org",
            "url": "https://xenbits.xenproject.org/xsa/advisory-507.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.openwall.com/lists/oss-security/2026/07/28/23"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://xenbits.xen.org/xsa/advisory-507.html"
          }
        ],
        "sourceIdentifier": "security@xen.org",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-07-28T18:11:11+00:00",
      "cve": "CVE-2026-62434",
      "id": "CVE-2026-62434",
      "initial_release_date": "2026-07-28T12:33:08.540000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "xen: Xen: Memory corruption via guest reclaiming special pages with Populated on Demand (PoD) enabled",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-62434.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:48:56Z",
      "cve": "CVE-2026-62434",
      "id": "CVE-2026-62434",
      "initial_release_date": "2026-07-30T16:35:44Z",
      "product_status:known_affected": "462",
      "product_status:recommended": "128",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-62434",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-62434.json",
      "version": "7"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2026-07-28T16:33:34.668Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "http://xenbits.xen.org/xsa/advisory-507.html"
              },
              {
                "url": "http://www.openwall.com/lists/oss-security/2026/07/28/23"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "NETWORK",
                  "availabilityImpact": "LOW",
                  "baseScore": 5.3,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-62434",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-28T14:59:52.970334Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-787",
                    "description": "CWE-787 Out-of-bounds Write",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-28T14:59:13.270Z",
              "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-507"
                }
              ]
            }
          ],
          "configurations": [
            {
              "lang": "en",
              "value": "All Xen versions from 3.4 onwards are vulnerable.  Xen versions 3.3 and\nearlier are not vulnerable.\n\nOnly x86 systems are vulnerable.\n\nOnly x86 HVM and PVH guests started in populate-on-demand mode are\nbelieved to be able to leverage the vulnerability.  Populate-on-demand\nmode is activated when the guest\u0027s xl configuration file specifies a\n\"maxmem\" value which is larger than the \"memory\" value."
            }
          ],
          "datePublic": "2026-07-28T12:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "A guest started with Populated on Demand enabled (PoD) can attempt to\nreclaim pages which aren\u0027t regular guest RAM.  This can cause corruption\nof memory management state in Xen."
            }
          ],
          "impacts": [
            {
              "descriptions": [
                {
                  "lang": "en",
                  "value": "A buggy or malicious guest can cause corruption of Xen\u0027s state, leading\nto crashes or other malfunctions.  Information leak and privilege\nescalation cannot be ruled out."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-28T12:33:08.540Z",
            "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
            "shortName": "XEN"
          },
          "references": [
            {
              "url": "https://xenbits.xenproject.org/xsa/advisory-507.html"
            }
          ],
          "title": "PoD: Don\u0027t try to reclaim special pages",
          "workarounds": [
            {
              "lang": "en",
              "value": "Running only PV guests or HVM/PVH guests without PoD will avoid the\nvulnerability."
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "assignerShortName": "XEN",
        "cveId": "CVE-2026-62434",
        "datePublished": "2026-07-28T12:33:08.540Z",
        "dateReserved": "2026-07-14T10:28:12.655Z",
        "dateUpdated": "2026-07-28T16:33:34.668Z",
        "state": "PUBLISHED"
      },
      "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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.