FKIE_CVE-2026-58100

Vulnerability from fkie_nvd - Published: 2026-10-15 07:18 - Updated: 2026-10-16 15:17
Severity
Summary
kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check. Because the child's table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent's table and register knotes with file descriptor numbers beyond the end of the child's table, causing an out-of-bounds read. An unprivileged local user may be able to exploit these races to escalate privileges.
References
secteam@freebsd.orghttps://security.freebsd.org/advisories/FreeBSD-SA-26:65.kqueue.asc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "kqueue"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p4",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "source": "secteam@freebsd.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "kqueue_fork_copy_knote() indexed into the child\u0027s file descriptor table using a knote\u0027s file descriptor number without a bounds check.  Because the child\u0027s table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent\u0027s table and register knotes with file descriptor numbers beyond the end of the child\u0027s table, causing an out-of-bounds read.\n\nAn unprivileged local user may be able to exploit these races to escalate privileges."
    }
  ],
  "id": "CVE-2026-58100",
  "lastModified": "2026-10-16T15:17:32.873",
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-58100",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T03:56:56.154892Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-15T07:18:02.490",
  "references": [
    {
      "source": "secteam@freebsd.org",
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:65.kqueue.asc"
    }
  ],
  "sourceIdentifier": "secteam@freebsd.org",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "secteam@freebsd.org",
      "type": "Secondary"
    }
  ]
}



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