usn-8193-1
Vulnerability from osv_ubuntu
Published
2026-04-21 15:45
Modified
2026-04-29 08:24
Summary
libcap2 vulnerability
Details

Ali Raza discovered that libcap incorrectly handled file capability updates. A local attacker could possibly use this issue to inject or strip capabilities into arbitrary executables and escalate privileges.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-4878",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/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:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libcap2",
            "binary_version": "1:2.44-1ubuntu0.22.04.3"
          },
          {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.44-1ubuntu0.22.04.3"
          },
          {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.44-1ubuntu0.22.04.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libcap2",
        "purl": "pkg:deb/ubuntu/libcap2@1:2.44-1ubuntu0.22.04.3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.44-1ubuntu0.22.04.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.44-1build1",
        "1:2.44-1build2",
        "1:2.44-1build3",
        "1:2.44-1ubuntu0.22.04.1",
        "1:2.44-1ubuntu0.22.04.2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-4878",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/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:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libcap2",
            "binary_version": "1:2.66-5ubuntu2.4"
          },
          {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.66-5ubuntu2.4"
          },
          {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.66-5ubuntu2.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libcap2",
        "purl": "pkg:deb/ubuntu/libcap2@1:2.66-5ubuntu2.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.66-5ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.66-4ubuntu1",
        "1:2.66-5ubuntu1",
        "1:2.66-5ubuntu2",
        "1:2.66-5ubuntu2.1",
        "1:2.66-5ubuntu2.2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-4878",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/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:25.10"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-kernel-pub-linux-libs-security-libcap-dev",
            "binary_version": "1:2.75-7ubuntu2.2"
          },
          {
            "binary_name": "libcap2",
            "binary_version": "1:2.75-7ubuntu2.2"
          },
          {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.75-7ubuntu2.2"
          },
          {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.75-7ubuntu2.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libcap2",
        "purl": "pkg:deb/ubuntu/libcap2@1:2.75-7ubuntu2.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.75-7ubuntu2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.73-4ubuntu1",
        "1:2.75-7ubuntu1",
        "1:2.75-7ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "Ali Raza discovered that libcap incorrectly handled file capability\nupdates. A local attacker could possibly use this issue to inject or strip\ncapabilities into arbitrary executables and escalate privileges.",
  "id": "USN-8193-1",
  "modified": "2026-04-29T08:24:42Z",
  "published": "2026-04-21T15:45:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8193-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-4878"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "libcap2 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-4878"
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.