Vulnerability-Lookup

CVE-2026-23557 (GCVE-0-2026-23557)

Vulnerability from cvelistv5 – Published: 2026-05-19 12:49 – Updated: 2026-05-19 14:42

Title

Xenstored DoS via XS_RESET_WATCHES command

Summary

Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert() triggering. In case xenstored was built with NDEBUG #defined nothing bad will happen, as assert() is doing nothing in this case. Note that the default is not to define NDEBUG for xenstored builds even in release builds of Xen.

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 2026-05-19 14:42 UTC

CWE

CWE-617 - Reachable Assertion

Assigner

XEN CNA under the mitre root

CNA scorecard D 56/100 over 46 records in the last 180 days details

References

3 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-484.html
http://www.openwall.com/lists/oss-security/2026/0…
http://xenbits.xen.org/xsa/advisory-484.html

Impacted products

1 product

Vendor	Product	Version	CPE status
Xen	Xen	Unknown: consult Xen advisory XSA-484	guessed

Date Public

2026-04-28 12:00

Credits

This issue was discovered by Andrii Sultanov of Vates.

Show details on NVD website

JSON

To clipboard

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}

CERTFR-2026-AVI-0509

Vulnerability from certfr_avis - Published: 2026-04-29 - Updated: 2026-04-29

De multiples vulnérabilités ont été découvertes dans Xen. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
XEN	Xen	Xen toutes versions utilisant XAPI sans les derniers correctifs de sécurité
XEN	Xen	Xen toutes versions incluant le correctif de sécurité XSA-419 sans le correctif xsa483-xapi.patch pour Xen XAPI oxenstored
XEN	Xen	Xen sur systèmes x86 ou Arm PVH ou HVM avec un noyau linux postérieur à 3.8 sans le correctif de sécurité xsa487-linux.patch
XEN	Xen	Xen toutes versions incluant le correctif de sécurité XSA-419 sans le correctif xsa483.patch pour Xen 4.18.x
XEN	Xen	Xen versions postérieures ou égales à 4.2 sans le correctif de sécurité xsa484.patch applicable pour Xen 4.18.x
XEN	Xen	Xen versions 4.17.x et 4.18.x sans le correctif de sécurité xsa486-4.18.patch
XEN	Xen	Xen versions postérieures ou égales à 4.2 sans le correctif de sécurité xsa484-4.17.patch applicable pour Xen 4.17.x
XEN	Xen	Xen avec un noyau linux postérieur à 4.12 sans le correctif de sécurité xsa485-linux.patch
XEN	Xen	Xen versions 4.19.x sans le correctif de sécurité xsa486.patch
XEN	Xen	Xen toutes versions incluant le correctif de sécurité XSA-419 sans le correctif xsa483-4.17.patch pour Xen 4.17.x

References

Title

Publication Time

FKIE_CVE-2026-23557

Vulnerability from fkie_nvd - Published: 2026-05-19 14:16 - Updated: 2026-10-14 20:10

Severity

6.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Summary

References

URL	Tags
security@xen.org	https://xenbits.xenproject.org/xsa/advisory-484.html	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/04/28/11	Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://xenbits.xen.org/xsa/advisory-484.html	Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	xen	xen	*

JSON

To clipboard

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          "product": "Xen",
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          "versions": [
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    },
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      "lang": "es",
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    }
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  "lastModified": "2026-10-14T20:10:00.190",
  "metrics": {
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          "attackComplexity": "LOW",
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    }
  ],
  "sourceIdentifier": "security@xen.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

GHSA-9879-VJ7M-R497

Vulnerability from github – Published: 2026-05-19 15:31 – Updated: 2026-05-19 18:32

Details

Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert() triggering.

In case xenstored was built with NDEBUG #defined nothing bad will happen, as assert() is doing nothing in this case. Note that the default is not to define NDEBUG for xenstored builds even in release builds of Xen.

Severity

6.5 (Medium)


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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23557"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-19T14:16:38Z",
    "severity": "MODERATE"
  },
  "details": "Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES\ncommand within a transaction due to an assert() triggering.\n\nIn case xenstored was built with NDEBUG #defined nothing bad will\nhappen, as assert() is doing nothing in this case. Note that the\ndefault is not to define NDEBUG for xenstored builds even in release\nbuilds of Xen.",
  "id": "GHSA-9879-vj7m-r497",
  "modified": "2026-05-19T18:32:08Z",
  "published": "2026-05-19T15:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23557"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-484.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/28/11"
    },
    {
      "type": "WEB",
      "url": "http://xenbits.xen.org/xsa/advisory-484.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

OPENSUSE-SU-2026:10660-1

Vulnerability from csaf_opensuse - Published: 2026-04-29 00:00 - Updated: 2026-09-17 17:02

Summary

xen-4.21.1_04-1.1 on GA media

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:1645-1

Vulnerability from csaf_suse - Published: 2026-04-28 14:46 - Updated: 2026-09-16 19:19

Summary

Security update for xen

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 1 product

Open the full advisory

SUSE-SU-2026:1657-1

Vulnerability from csaf_suse - Published: 2026-04-29 11:06 - Updated: 2026-09-16 19:19

Summary

Security update for xen

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 37 products

Open the full advisory

SUSE-SU-2026:1692-1

Vulnerability from csaf_suse - Published: 2026-05-05 08:03 - Updated: 2026-09-16 19:20

Summary

Security update for xen

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 2 products

Open the full advisory

SUSE-SU-2026:1743-1

Vulnerability from csaf_suse - Published: 2026-05-07 07:15 - Updated: 2026-05-07 07:15

Summary

Security update for xen

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 6 products

Open the full advisory

SUSE-SU-2026:1998-1

Vulnerability from csaf_suse - Published: 2026-05-19 07:10 - Updated: 2026-05-19 07:10

Summary

Security update for xen

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 6 products

Open the full advisory

SUSE-SU-2026:2066-1

Vulnerability from csaf_suse - Published: 2026-05-26 07:28 - Updated: 2026-09-16 19:33

Summary

Security update for xen

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-23557.

CVE-2026-23557

6.5 (Medium)


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

Recommended: 39 products

Open the full advisory

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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CVE-2026-23557 (GCVE-0-2026-23557)

Solutions

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour