CVE-2026-49412 (GCVE-0-2026-49412)

Vulnerability from cvelistv5 – Published: 2026-06-27 09:02 – Updated: 2026-06-30 03:55
VLAI
Title
Use-after-free bug in the IPV6_MSFILTER socket option handler
Summary
The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory. An unprivileged local user can exploit this use-after-free to escalate privileges.
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 2026-06-29 00:00 UTC
CWE
Assigner
freebsd CNA under the mitre root
CNA scorecard D 60/100 over 67 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
FreeBSD FreeBSD Affected: 15.0-RELEASE , < p10 (release)
Affected: 14.4-RELEASE , < p6 (release)
Affected: 14.3-RELEASE , < p15 (release)
guessed Create a notification for this product.
Date Public
2026-06-09 23:30
Credits
Andrew Griffiths at Calif.io Maik Münch
Show details on NVD website
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-2026-49412",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-29T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-30T03:55:29.049Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "ip6_multicast"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p10",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p6",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p15",
              "status": "affected",
              "version": "14.3-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Andrew Griffiths at Calif.io"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Maik M\u00fcnch"
        }
      ],
      "datePublic": "2026-06-09T23:30:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock.  During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory.\n\nAn unprivileged local user can exploit this use-after-free to escalate privileges."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416: Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-27T09:02:55.482Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"
        }
      ],
      "title": "Use-after-free bug in the IPV6_MSFILTER socket option handler",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-49412",
    "datePublished": "2026-06-27T09:02:55.482Z",
    "dateReserved": "2026-05-29T20:24:28.615Z",
    "dateUpdated": "2026-06-30T03:55:29.049Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-49412",
      "date": "2026-10-24",
      "epss": "0.00153",
      "percentile": "0.04127"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unknown",
                "modules": [
                  "ip6_multicast"
                ],
                "product": "FreeBSD",
                "vendor": "FreeBSD",
                "versions": [
                  {
                    "lessThan": "p10",
                    "status": "affected",
                    "version": "15.0-RELEASE",
                    "versionType": "release"
                  },
                  {
                    "lessThan": "p6",
                    "status": "affected",
                    "version": "14.4-RELEASE",
                    "versionType": "release"
                  },
                  {
                    "lessThan": "p15",
                    "status": "affected",
                    "version": "14.3-RELEASE",
                    "versionType": "release"
                  }
                ]
              }
            ],
            "source": "secteam@freebsd.org"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*",
                    "matchCriteriaId": "9DC7C54E-58AF-4ADE-84AF-0EF0F325E20E",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*",
                    "matchCriteriaId": "D3D22B8C-36CF-4800-9673-0B0240558BDD",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*",
                    "matchCriteriaId": "7296F5AA-F8C1-4277-A4EE-C2B24073A320",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*",
                    "matchCriteriaId": "C30E4A9C-0594-4F40-92B3-26CB9AA85AE9",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*",
                    "matchCriteriaId": "9F83F91B-587A-433C-99DB-0D63E267FF16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*",
                    "matchCriteriaId": "44B9C2FC-756E-459F-8E68-C2C2B8C258AC",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p14:*:*:*:*:*:*",
                    "matchCriteriaId": "A11526CF-505E-47DF-8388-65CB216D2022",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*",
                    "matchCriteriaId": "242FA2A8-5D7D-4617-A411-2651FF3A3E4C",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*",
                    "matchCriteriaId": "40573F60-F3B7-4AEC-846A-B08E5B7D9D00",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*",
                    "matchCriteriaId": "1FB832CE-0A98-44A2-8BAC-CD38A64279B6",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*",
                    "matchCriteriaId": "9A785F8E-C218-41AE-8D57-BF06DDAEF7CB",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*",
                    "matchCriteriaId": "C3909FDD-B2A2-45B6-A40B-1D303A717F15",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*",
                    "matchCriteriaId": "720597A2-F181-46E1-8A0D-097E17ADC4FB",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*",
                    "matchCriteriaId": "DC8A75D0-148A-427A-9783-45477EABED21",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*",
                    "matchCriteriaId": "F5D39FC9-6DBA-46C8-BB80-A6188E6A8527",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*",
                    "matchCriteriaId": "8F3856BE-666F-4FA1-A6AD-FE179CEBF1E4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*",
                    "matchCriteriaId": "D9CC0037-3282-42C3-80D8-F6C1D43B9332",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*",
                    "matchCriteriaId": "1EADA828-3C20-43C0-A0CA-3AC7D7F23DBD",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*",
                    "matchCriteriaId": "53D73FD2-4B06-47D3-BA2A-4363E9DE3565",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*",
                    "matchCriteriaId": "D726890B-E679-43A9-A211-D5C05BBE3941",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:*",
                    "matchCriteriaId": "CBE94635-5277-4050-8098-F062091F6596",
                    "vulnerable": true
                  },
                  {
                    "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: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
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock.  During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory.\n\nAn unprivileged local user can exploit this use-after-free to escalate privileges."
          }
        ],
        "id": "CVE-2026-49412",
        "lastModified": "2026-07-01T14:04:44.963",
        "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-2026-49412",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-29T00:00:00+00:00",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-06-27T09:16:23.937",
        "references": [
          {
            "source": "secteam@freebsd.org",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"
          }
        ],
        "sourceIdentifier": "secteam@freebsd.org",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "secteam@freebsd.org",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "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-2026-49412",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-29T13:06:26.101458Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-29T13:06:20.730Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unknown",
              "modules": [
                "ip6_multicast"
              ],
              "product": "FreeBSD",
              "vendor": "FreeBSD",
              "versions": [
                {
                  "lessThan": "p10",
                  "status": "affected",
                  "version": "15.0-RELEASE",
                  "versionType": "release"
                },
                {
                  "lessThan": "p6",
                  "status": "affected",
                  "version": "14.4-RELEASE",
                  "versionType": "release"
                },
                {
                  "lessThan": "p15",
                  "status": "affected",
                  "version": "14.3-RELEASE",
                  "versionType": "release"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Andrew Griffiths at Calif.io"
            },
            {
              "lang": "en",
              "type": "finder",
              "value": "Maik M\u00fcnch"
            }
          ],
          "datePublic": "2026-06-09T23:30:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock.  During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory.\n\nAn unprivileged local user can exploit this use-after-free to escalate privileges."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-416",
                  "description": "CWE-416: Use After Free",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-27T09:02:55.482Z",
            "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
            "shortName": "freebsd"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"
            }
          ],
          "title": "Use-after-free bug in the IPV6_MSFILTER socket option handler",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "assignerShortName": "freebsd",
        "cveId": "CVE-2026-49412",
        "datePublished": "2026-06-27T09:02:55.482Z",
        "dateReserved": "2026-05-29T20:24:28.615Z",
        "dateUpdated": "2026-06-30T03:55:29.049Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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

JSON

Loading timeline…




    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.