usn-3836-1
Vulnerability from osv_ubuntu
Published
2018-12-03 19:40
Modified
2026-04-22 07:36
Summary
linux, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities
Details

Jann Horn discovered that the Linux kernel mishandles mapping UID or GID ranges inside nested user namespaces in some situations. A local attacker could use this to bypass access controls on resources outside the namespace. (CVE-2018-18955)

Philipp Wendler discovered that the overlayfs implementation in the Linux kernel did not properly verify the directory contents permissions from within a unprivileged user namespace. A local attacker could use this to expose sensitive information (protected file names). (CVE-2018-6559)

References
To clipboard 

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        "4.15.0-1005.5",
        "4.15.0-1006.6",
        "4.15.0-1008.8",
        "4.15.0-1009.9",
        "4.15.0-1010.10",
        "4.15.0-1014.14",
        "4.15.0-1015.15",
        "4.15.0-1017.18",
        "4.15.0-1018.19",
        "4.15.0-1019.20",
        "4.15.0-1021.22",
        "4.15.0-1023.24",
        "4.15.0-1024.25"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-6559",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-18955",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-headers-4.15.0-1027-kvm",
            "binary_version": "4.15.0-1027.27"
          },
          {
            "binary_name": "linux-image-4.15.0-1027-kvm",
            "binary_version": "4.15.0-1027.27"
          },
          {
            "binary_name": "linux-kvm-headers-4.15.0-1027",
            "binary_version": "4.15.0-1027.27"
          },
          {
            "binary_name": "linux-kvm-tools-4.15.0-1027",
            "binary_version": "4.15.0-1027.27"
          },
          {
            "binary_name": "linux-modules-4.15.0-1027-kvm",
            "binary_version": "4.15.0-1027.27"
          },
          {
            "binary_name": "linux-tools-4.15.0-1027-kvm",
            "binary_version": "4.15.0-1027.27"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "linux-kvm",
        "purl": "pkg:deb/ubuntu/linux-kvm@4.15.0-1027.27?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1027.27"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.15.0-1002.2",
        "4.15.0-1003.3",
        "4.15.0-1004.4",
        "4.15.0-1006.6",
        "4.15.0-1008.8",
        "4.15.0-1010.10",
        "4.15.0-1011.11",
        "4.15.0-1012.12",
        "4.15.0-1016.16",
        "4.15.0-1017.17",
        "4.15.0-1019.19",
        "4.15.0-1020.20",
        "4.15.0-1021.21",
        "4.15.0-1023.23",
        "4.15.0-1025.25",
        "4.15.0-1026.26"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-6559",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-18955",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-headers-4.15.0-1029-raspi2",
            "binary_version": "4.15.0-1029.31"
          },
          {
            "binary_name": "linux-image-4.15.0-1029-raspi2",
            "binary_version": "4.15.0-1029.31"
          },
          {
            "binary_name": "linux-modules-4.15.0-1029-raspi2",
            "binary_version": "4.15.0-1029.31"
          },
          {
            "binary_name": "linux-raspi2-headers-4.15.0-1029",
            "binary_version": "4.15.0-1029.31"
          },
          {
            "binary_name": "linux-raspi2-tools-4.15.0-1029",
            "binary_version": "4.15.0-1029.31"
          },
          {
            "binary_name": "linux-tools-4.15.0-1029-raspi2",
            "binary_version": "4.15.0-1029.31"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "linux-raspi2",
        "purl": "pkg:deb/ubuntu/linux-raspi2@4.15.0-1029.31?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1029.31"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.13.0-1005.5",
        "4.13.0-1006.6",
        "4.13.0-1008.8",
        "4.15.0-1006.7",
        "4.15.0-1009.10",
        "4.15.0-1010.11",
        "4.15.0-1011.12",
        "4.15.0-1012.13",
        "4.15.0-1013.14",
        "4.15.0-1017.18",
        "4.15.0-1018.19",
        "4.15.0-1020.22",
        "4.15.0-1021.23",
        "4.15.0-1022.24",
        "4.15.0-1024.26",
        "4.15.0-1026.28",
        "4.15.0-1027.29",
        "4.15.0-1028.30"
      ]
    }
  ],
  "aliases": [],
  "details": "Jann Horn discovered that the Linux kernel mishandles mapping UID or GID\nranges inside nested user namespaces in some situations. A local attacker\ncould use this to bypass access controls on resources outside the\nnamespace. (CVE-2018-18955)\n\nPhilipp Wendler discovered that the overlayfs implementation in the Linux\nkernel did not properly verify the directory contents permissions from\nwithin a unprivileged user namespace. A local attacker could use this to\nexpose sensitive information (protected file names). (CVE-2018-6559)\n",
  "id": "USN-3836-1",
  "modified": "2026-04-22T07:36:36Z",
  "published": "2018-12-03T19:40:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3836-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-6559"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-18955"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2018-6559",
    "UBUNTU-CVE-2018-18955"
  ]
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.