Vulnerability-Lookup

UBUNTU-CVE-2023-46841 (CVE-2023-46841)

Vulnerability from osv_ubuntu – Published: 2024-03-20 11:15 – Updated: 2026-10-17 09:18 – Source website

Details

Recent x86 CPUs offer functionality named Control-flow Enforcement Technology (CET). A sub-feature of this are Shadow Stacks (CET-SS). CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and return addresses are accompanied by so called "shadow stacks", holding little more than return addresses. Shadow stacks aren't writable by normal instructions, and upon function returns their contents are used to check for possible manipulation of a return address coming from the traditional stack. In particular certain memory accesses need intercepting by Xen. In various cases the necessary emulation involves kind of replaying of the instruction. Such replaying typically involves filling and then invoking of a stub. Such a replayed instruction may raise an exceptions, which is expected and dealt with accordingly. Unfortunately the interaction of both of the above wasn't right: Recovery involves removal of a call frame from the (traditional) stack. The counterpart of this operation for the shadow stack was missing.

Severity

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2023-46841	REPORT
	https://xenbits.xen.org/xsa/advisory-451.html	REPORT
	https://www.cve.org/CVERecord?id=CVE-2023-46841	REPORT

JSON

To clipboard

{
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      "versions": [
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        "4.20.0+68-g35cb38b222-1"
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    },
    {
      "ecosystem_specific": {
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            "binary_version": "4.20.3+127-gc42374a105-1"
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          {
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      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "xen",
        "purl": "pkg:deb/ubuntu/xen@4.20.3+127-gc42374a105-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.20.2+7-g1badcf5035-2build2",
        "4.20.2+37-g61ff35323e-1ubuntu1",
        "4.20.3+127-gc42374a105-1"
      ]
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    {
      "ecosystem_specific": {
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            "binary_name": "libxencall1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
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            "binary_name": "libxendevicemodel1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenevtchn1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
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          {
            "binary_name": "libxenforeignmemory1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
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            "binary_name": "libxengnttab1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
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            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenmisc4.20",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxenstore4",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
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          {
            "binary_name": "libxentoolcore1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "libxentoollog1",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
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            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-hypervisor-4.20-arm64",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
          {
            "binary_name": "xen-hypervisor-common",
            "binary_version": "4.20.2+7-g1badcf5035-2build2"
          },
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        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "xen",
        "purl": "pkg:deb/ubuntu/xen@4.20.2+7-g1badcf5035-2build2?arch=source\u0026distro=resolute"
      },
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          ],
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        "4.20.0+68-g35cb38b222-1",
        "4.20.2+7-g1badcf5035-2",
        "4.20.2+7-g1badcf5035-2build2"
      ]
    }
  ],
  "aliases": [],
  "details": "Recent x86 CPUs offer functionality named Control-flow Enforcement Technology (CET).  A sub-feature of this are Shadow Stacks (CET-SS). CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and return addresses are accompanied by so called \"shadow stacks\", holding little more than return addresses.  Shadow stacks aren\u0027t writable by normal instructions, and upon function returns their contents are used to check for possible manipulation of a return address coming from the traditional stack. In particular certain memory accesses need intercepting by Xen.  In various cases the necessary emulation involves kind of replaying of the instruction.  Such replaying typically involves filling and then invoking of a stub.  Such a replayed instruction may raise an exceptions, which is expected and dealt with accordingly. Unfortunately the interaction of both of the above wasn\u0027t right: Recovery involves removal of a call frame from the (traditional) stack. The counterpart of this operation for the shadow stack was missing.",
  "id": "UBUNTU-CVE-2023-46841",
  "modified": "2026-10-17T09:18:16Z",
  "published": "2024-03-20T11:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-46841"
    },
    {
      "type": "REPORT",
      "url": "https://xenbits.xen.org/xsa/advisory-451.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-46841"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-46841"
  ]
}

CVE-2023-46841 (GCVE-0-2023-46841)

Vulnerability from cvelistv5 – Published: 2024-03-20 10:40 – Updated: 2025-11-04 18:18

Title

x86: shadow stack vs exceptions from emulation stubs

Summary

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 2024-03-25 16:09 UTC

CWE

CWE-noinfo Not enough information

Assigner

XEN CNA under the mitre root

CNA scorecard D 56/100 over 48 records in the last 180 days details

References

4 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-451.html
https://lists.fedoraproject.org/archives/list/pac…
http://xenbits.xen.org/xsa/advisory-451.html
https://lists.fedoraproject.org/archives/list/pac…

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-451

Date Public

2024-02-27 10:38

Credits

This issue was discovered by Jan Beulich of SUSE.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-46841",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-25T16:09:38.636466Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-05T18:53:05.398Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T18:18:57.552Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://xenbits.xenproject.org/xsa/advisory-451.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZON4TLXG7TG4A2XZG563JMVTGQW4SF3A/"
          },
          {
            "url": "http://xenbits.xen.org/xsa/advisory-451.html"
          },
          {
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HES2IJXZY3H7HBPP4NVSVYYNGW254DMI/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-451"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Xen 4.14 and onwards are vulnerable.  Xen 4.13 and older are not\nvulnerable.\n\nOnly x86 systems with CET-SS enabled are vulnerable.  x86 systems with\nCET-SS unavailable or disabled are not vulnerable.  Arm systems are not\nvulnerable.  See\nhttps://xenbits.xen.org/docs/latest/faq.html#tell-if-cet-is-active\nfor how to determine whether CET-SS is active.\n\nOnly HVM or PVH guests can leverage the vulnerability.  PV guests cannot\nleverage the vulnerability."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered by Jan Beulich of SUSE."
        }
      ],
      "datePublic": "2024-02-27T10:38:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Recent x86 CPUs offer functionality named Control-flow Enforcement\nTechnology (CET).  A sub-feature of this are Shadow Stacks (CET-SS).\nCET-SS is a hardware feature designed to protect against Return Oriented\nProgramming attacks. When enabled, traditional stacks holding both data\nand return addresses are accompanied by so called \"shadow stacks\",\nholding little more than return addresses.  Shadow stacks aren\u0027t\nwritable by normal instructions, and upon function returns their\ncontents are used to check for possible manipulation of a return address\ncoming from the traditional stack.\n\nIn particular certain memory accesses need intercepting by Xen.  In\nvarious cases the necessary emulation involves kind of replaying of\nthe instruction.  Such replaying typically involves filling and then\ninvoking of a stub.  Such a replayed instruction may raise an\nexceptions, which is expected and dealt with accordingly.\n\nUnfortunately the interaction of both of the above wasn\u0027t right:\nRecovery involves removal of a call frame from the (traditional) stack.\nThe counterpart of this operation for the shadow stack was missing."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "An unprivileged guest can cause a hypervisor crash, causing a Denial of\nService (DoS) of the entire host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-03-23T03:06:14.246Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-451.html"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZON4TLXG7TG4A2XZG563JMVTGQW4SF3A/"
        }
      ],
      "title": "x86: shadow stack vs exceptions from emulation stubs",
      "workarounds": [
        {
          "lang": "en",
          "value": "While in principle it is possible to disable use of CET on capable\nsystems using the \"cet=no-shstk\" command line option, doing so disables\nan important security feature and may therefore not be advisable."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2023-46841",
    "datePublished": "2024-03-20T10:40:36.597Z",
    "dateReserved": "2023-10-27T07:55:35.333Z",
    "dateUpdated": "2025-11-04T18:18:57.552Z",
    "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.

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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