Vulnerability-Lookup

FKIE_CVE-2026-58094

Vulnerability from fkie_nvd - Published: 2026-08-26 06:16 - Updated: 2026-09-24 13:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is intended to be used immediately after creating the object, before any memory is allocated for the object. The handler checked whether a page size had already been configured without holding the rangelock. Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state. An unprivileged local user can exploit this race to escalate privileges.

References

	URL	Tags
	secteam@freebsd.org	https://security.freebsd.org/advisories/FreeBSD-SA-26:63.posixshm.asc	Vendor Advisory

Impacted products

Vendor	Product	Version
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.1
freebsd	freebsd	15.1

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "posixshm"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
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              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
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              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p9",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "source": "secteam@freebsd.org"
    }
  ],
  "configurations": [
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              "vulnerable": true
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          "negate": false,
          "operator": "OR"
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object.  This is intended to be used immediately after creating the object, before any memory is allocated for the object.  The handler checked whether a page size had already been configured without holding the rangelock.  Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state.\n\nAn unprivileged local user can exploit this race to escalate privileges."
    }
  ],
  "id": "CVE-2026-58094",
  "lastModified": "2026-09-24T13:17:24.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-58094",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-26T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-26T06:16:26.350",
  "references": [
    {
      "source": "secteam@freebsd.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:63.posixshm.asc"
    }
  ],
  "sourceIdentifier": "secteam@freebsd.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "secteam@freebsd.org",
      "type": "Secondary"
    }
  ]
}

CVE-2026-58094 (GCVE-0-2026-58094)

Vulnerability from cvelistv5 – Published: 2026-08-26 05:39 – Updated: 2026-08-27 03:57

Title

TOCTOU race in POSIX shared memory large page configuration

Summary

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 00:00 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

freebsd CNA under the mitre root

CNA scorecard D 60/100 over 69 records in the last 180 days details

References

1 reference

URL	Tags
https://security.freebsd.org/advisories/FreeBSD-S…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
FreeBSD	FreeBSD	Affected: 15.1-RELEASE , < p3 (release) Affected: 15.0-RELEASE , < p13 (release) Affected: 14.4-RELEASE , < p9 (release)

Date Public

2026-08-25 19:45

Credits

tsune of GMO Cybersecurity by Ierae, Inc. working with TrendAI Zero Day Initiative

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-58094",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-26T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-27T03:57:03.732Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "posixshm"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p3",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p13",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p9",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "tsune of GMO Cybersecurity by Ierae, Inc. working with TrendAI Zero Day Initiative"
        }
      ],
      "datePublic": "2026-08-25T19:45:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object.  This is intended to be used immediately after creating the object, before any memory is allocated for the object.  The handler checked whether a page size had already been configured without holding the rangelock.  Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state.\n\nAn unprivileged local user can exploit this race to escalate privileges."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-26T05:39:42.893Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:63.posixshm.asc"
        }
      ],
      "title": "TOCTOU race in POSIX shared memory large page configuration",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-58094",
    "datePublished": "2026-08-26T05:39:42.893Z",
    "dateReserved": "2026-06-29T01:40:17.499Z",
    "dateUpdated": "2026-08-27T03:57:03.732Z",
    "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

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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

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