Vulnerability-Lookup

SUSE-SU-2026:4089-1

Vulnerability from csaf_suse - Published: 2026-09-08 12:26 - Updated: 2026-09-16 20:56

Summary

Security update for xen

Severity

Moderate

Notes

Title of the patch: Security update for xen

Description of the patch: This update for xen fixes the following issues: - CVE-2026-62437: x86: DMs may cause mem leak by IRQ binding (bsc#1276838). - CVE-2026-79602: x86: improper handling of HVM emulation return codes (bsc#1276839).

Patchnames: SUSE-2026-4089,SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-4089

CVE-2026-62437

6.5 (Medium)


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

Affected products

Recommended 28 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-devel-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-doc-html-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-libs-32bit-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-libs-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-tools-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:xen-tools-domU-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-devel-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-doc-html-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-libs-32bit-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-libs-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-tools-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:xen-tools-domU-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-devel-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-doc-html-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-libs-32bit-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-libs-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-tools-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-tools-domU-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-devel-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-doc-html-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-libs-32bit-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-libs-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-4.12.4_74-3.151.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-domU-4.12.4_74-3.151.1.x86_64	—	Vendor Fix

Threats

Impact moderate

CVE-2026-79602

6.5 (Medium)


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

Affected products

Recommended 28 products, the same list as for CVE-2026-62437

Threats

Impact moderate

References

12 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1276838	self
https://bugzilla.suse.com/1276839	self
https://www.suse.com/security/cve/CVE-2026-62437/	self
https://www.suse.com/security/cve/CVE-2026-79602/	self
https://www.suse.com/security/cve/CVE-2026-62437	external
https://bugzilla.suse.com/1276838	external
https://www.suse.com/security/cve/CVE-2026-79602	external
https://bugzilla.suse.com/1276839	external

JSON

To clipboard

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          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-4.12.4_74-3.151.1.x86_64",
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        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-79602",
          "url": "https://www.suse.com/security/cve/CVE-2026-79602"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1276839 for CVE-2026-79602",
          "url": "https://bugzilla.suse.com/1276839"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise High Performance Computing 12 SP5:xen-4.12.4_74-3.151.1.x86_64",
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            "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:xen-doc-html-4.12.4_74-3.151.1.x86_64",
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:xen-tools-domU-4.12.4_74-3.151.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-09-08T12:26:42Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-79602"
    }
  ]
}

CVE-2026-62437 (GCVE-0-2026-62437)

Vulnerability from cvelistv5 – Published: 2026-09-08 12:10 – Updated: 2026-09-10 18:13

Title

x86: DMs may cause mem leak by IRQ binding

Summary

When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 18:11 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

XEN mitre root

References

3 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-509.html
http://xenbits.xen.org/xsa/advisory-509.html
http://www.openwall.com/lists/oss-security/2026/09/08/6

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-509

Date Public

2026-09-08 12:00

Credits

This issue was discovered by Jan Beulich of SUSE.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-08T17:08:26.757Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "url": "http://xenbits.xen.org/xsa/advisory-509.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/08/6"
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        ],
        "title": "CVE Program Container"
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
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              "baseScore": 6.5,
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              "integrityImpact": "NONE",
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              "scope": "CHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
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            "other": {
              "content": {
                "id": "CVE-2026-62437",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-10T18:11:30.445915Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-362",
                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-10T18:13:23.073Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-509"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "All Xen versions from at least 3.2 onwards are affected.  Older versions\nhave not been inspected.\n\nOnly HVM guests with assigned PCI devices can leverage the vulnerability."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Jan Beulich of SUSE."
        }
      ],
      "datePublic": "2026-09-08T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "When guests are terminated, various pieces of cleanup need carrying out.\nThe cleaning up of PCI devices which were assigned to guests, and the\nassociated removal of tracking structures for IRQs used by the devices\noccurs relatively early in the process.  Unfortunately after that point\nthe guest about to be terminated could cause its device model (DM) to\nre-establish such tracking structures, by having it bind one or more IRQs\nanew.  While some of those tracking structures would still be cleaned up\nlater on, at least one would not be."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A HVM guest with one or more PCI devices assigned can cause a memory leak\nin the hypervisor, possibly leading to Denial of Service (DoS) of the\nentire host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-08T12:10:52.643Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
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          "url": "https://xenbits.xenproject.org/xsa/advisory-509.html"
        }
      ],
      "title": "x86: DMs may cause mem leak by IRQ binding",
      "workarounds": [
        {
          "lang": "en",
          "value": "Running only PV or PVH guests will avoid the vulnerability.\n\nRunning only HVM guests without passing through PCI devices to them will\nalso avoid the vulnerability."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
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    "datePublished": "2026-09-08T12:10:52.643Z",
    "dateReserved": "2026-07-14T10:28:12.655Z",
    "dateUpdated": "2026-09-10T18:13:23.073Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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CVE-2026-79602 (GCVE-0-2026-79602)

Vulnerability from cvelistv5 – Published: 2026-09-08 12:11 – Updated: 2026-09-10 18:08

Title

x86: improper handling of HVM emulation return codes

Summary

A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 18:08 UTC

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Assigner

XEN mitre root

References

3 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-510.html
http://xenbits.xen.org/xsa/advisory-510.html
http://www.openwall.com/lists/oss-security/2026/09/08/7

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-510

Date Public

2026-09-08 12:00

Credits

This issue was discovered by Jiqian Chen of AMD and diagnosed as a security issue by Roger Pau Monné of AMD.

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-08T17:08:32.715Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "http://xenbits.xen.org/xsa/advisory-510.html"
          },
          {
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              "attackComplexity": "LOW",
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              "version": "3.1"
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                  }
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              },
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        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
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        }
      ],
      "datePublic": "2026-09-08T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A guest with a PCI device assigned that has at least a BAR on the IO port\nspace can trigger a BUG() in Xen."
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        {
          "descriptions": [
            {
              "lang": "en",
              "value": "Passing through a PCI device with at least one BAR in IO address space to\nunprivileged HVM guests can result in a Denial of Service (DoS) affecting\nthe entire host."
            }
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      ],
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          "url": "https://xenbits.xenproject.org/xsa/advisory-510.html"
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    "datePublished": "2026-09-08T12:11:08.534Z",
    "dateReserved": "2026-08-25T07:35:05.289Z",
    "dateUpdated": "2026-09-10T18:08:59.554Z",
    "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.

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.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

SUSE-SU-2026:4089-1

CVE-2026-62437 (GCVE-0-2026-62437)

CVE-2026-79602 (GCVE-0-2026-79602)

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Related by attack behaviour