CVE-2026-58099

{
  "id": "CVE-2026-58099",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-15T07:18:02.373",
  "lastModified": "2026-10-19T21:02:15.750",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) before marking them as in-flux and releasing the kqueue lock.  If another thread freed a marker while the lock was dropped, the subsequent in-flux decrement operated on freed memory.\n\nAn unprivileged local user may be able to exploit these races to escalate privileges."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "FreeBSD",
          "product": "FreeBSD",
          "defaultStatus": "unknown",
          "modules": [
            "kqueue"
          ],
          "versions": [
            {
              "version": "15.1-RELEASE",
              "lessThan": "p4",
              "versionType": "release",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T03:56:54.101667Z",
          "id": "CVE-2026-58099",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        },
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "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"
            },
            {
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              "criteria": "cpe:2.3:o:freebsd:freebsd:15.1:p2:*:*:*:*:*:*",
              "matchCriteriaId": "044A3D39-A2AF-499C-8434-0A07B5854661"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:freebsd:freebsd:15.1:p3:*:*:*:*:*:*",
              "matchCriteriaId": "C75C73C4-ED12-44D9-85EF-A0388D9ECFA2"
            }
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    }
  ],
  "references": [
    {
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:65.kqueue.asc",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}