Vulnerability-Lookup

FKIE_CVE-2026-58086

Vulnerability from fkie_nvd - Published: 2026-08-19 08:17 - Updated: 2026-08-31 18:44

Severity

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

Summary

As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user. Tracing configured by a jailed root user was therefore not flagged as privileged. An unprivileged user in a jail that has permission to debug the target process can modify the jailed root user's ktrace(2) flags, or disable tracing outright. A jailed root user therefore cannot reliably trace unprivileged processes.

References

	URL	Tags
	secteam@freebsd.org	https://security.freebsd.org/advisories/FreeBSD-SA-26:53.ktrace.asc	Vendor Advisory

Impacted products

Vendor	Product	Version
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
freebsd	freebsd	15.1
freebsd	freebsd	15.1

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "ktrace"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p2",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p12",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "source": "secteam@freebsd.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "368CFE5D-C5C2-42AF-AAF4-28DFE1A59C3B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*",
              "matchCriteriaId": "AA4AAA57-70A7-4717-ACF2-A253E757FF2C",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p10:*:*:*:*:*:*",
              "matchCriteriaId": "683CEB32-A634-4363-86FB-2BDC59724E3E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p11:*:*:*:*:*:*",
              "matchCriteriaId": "9EC8EE3F-9992-4A0F-A0CD-3B44BA086BD2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*",
              "matchCriteriaId": "E24ABFA6-4D12-4DE5-832B-438502C7D188",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*",
              "matchCriteriaId": "C1C9869C-494B-4628-9AA3-4AA5B989C377",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*",
              "matchCriteriaId": "002AA2FE-C7BA-471A-9434-0E56A878ACBF",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*",
              "matchCriteriaId": "B187670D-E3A2-4A0D-A653-982F8B447E78",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*",
              "matchCriteriaId": "047E7EE9-FB51-4CF2-A8BE-484BFD819565",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*",
              "matchCriteriaId": "2C9768AE-9954-4B2A-9525-D7D4942406E7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*",
              "matchCriteriaId": "F8B9EF55-3755-452A-B067-043803099B22",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:*",
              "matchCriteriaId": "EE3C4F40-A117-4B37-8CDD-096A1A763630",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.1:-:*:*:*:*:*:*",
              "matchCriteriaId": "BD327D43-A2DC-49B5-A578-D2116E1E12F3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.1:p1:*:*:*:*:*:*",
              "matchCriteriaId": "E379873C-DA04-4EAA-ABF6-EB87B4B471A8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.1:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "BF16D01F-95EC-4FE3-B32D-135CB82E8391",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.1:rc3-p1:*:*:*:*:*:*",
              "matchCriteriaId": "75973F7C-645A-438C-A03B-C77AAAD20C15",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user.  Tracing configured by a jailed root user was therefore not flagged as privileged.\n\nAn unprivileged user in a jail that has permission to debug the target process can modify the jailed root user\u0027s ktrace(2) flags, or disable tracing outright.  A jailed root user therefore cannot reliably trace unprivileged processes."
    }
  ],
  "id": "CVE-2026-58086",
  "lastModified": "2026-08-31T18:44:55.330",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-58086",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-27T15:54:51.867264Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-19T08:17:12.777",
  "references": [
    {
      "source": "secteam@freebsd.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:53.ktrace.asc"
    }
  ],
  "sourceIdentifier": "secteam@freebsd.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-273"
        }
      ],
      "source": "secteam@freebsd.org",
      "type": "Secondary"
    }
  ]
}

CVE-2026-58086 (GCVE-0-2026-58086)

Vulnerability from cvelistv5 – Published: 2026-08-19 07:42 – Updated: 2026-08-27 15:54

Title

ktrace(2) privilege incorrectly validated in jails

Summary

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 15:54 UTC

CWE

CWE-273 - Improper Check for Dropped Privileges

Assigner

freebsd mitre root

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 , < p2 (release) Affected: 15.0-RELEASE , < p12 (release)

Date Public

2026-07-29 22:40

Credits

Alexander Leidinger

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.1,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-58086",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-27T15:54:51.867264Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-27T15:54:55.678Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "ktrace"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p2",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p12",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Alexander Leidinger"
        }
      ],
      "datePublic": "2026-07-29T22:40:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user.  Tracing configured by a jailed root user was therefore not flagged as privileged.\n\nAn unprivileged user in a jail that has permission to debug the target process can modify the jailed root user\u0027s ktrace(2) flags, or disable tracing outright.  A jailed root user therefore cannot reliably trace unprivileged processes."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-273",
              "description": "CWE-273: Improper Check for Dropped Privileges",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T07:42:10.902Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:53.ktrace.asc"
        }
      ],
      "title": "ktrace(2) privilege incorrectly validated in jails",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-58086",
    "datePublished": "2026-08-19T07:42:10.902Z",
    "dateReserved": "2026-06-29T01:40:17.498Z",
    "dateUpdated": "2026-08-27T15:54:55.678Z",
    "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.

Action not permitted

FKIE_CVE-2026-58086

CVE-2026-58086 (GCVE-0-2026-58086)

Tags

Sightings

Nomenclature