ubuntu-cve-2026-56109
Vulnerability from osv_ubuntu
Published
2026-06-22 18:16
Modified
2026-07-14 18:51
Summary
Details

The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt memory by supplying maliciously crafted ALSA configuration text. When parsing nested compound or array configuration blocks, parse_def() fails to check return values before continuing, causing snd_config_delete() to be called twice on the same already-freed node, resulting in a NULL-pointer write or invalid memory read.

Severity
6.8 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
7.0 (High)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.0.27.2-3ubuntu7"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.0.27.2-3ubuntu7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.0.27.2-3ubuntu7?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.27.2-1ubuntu6",
        "1.0.27.2-1ubuntu7",
        "1.0.27.2-3ubuntu1",
        "1.0.27.2-3ubuntu2",
        "1.0.27.2-3ubuntu5",
        "1.0.27.2-3ubuntu6",
        "1.0.27.2-3ubuntu7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.1.0-0ubuntu1"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.1.0-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.1.0-0ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.29-0ubuntu1",
        "1.1.0-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.1.3-5ubuntu0.6"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.1.3-5ubuntu0.6"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.1.3-5ubuntu0.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.1.3-5ubuntu0.6?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.3-5",
        "1.1.3-5ubuntu0.1",
        "1.1.3-5ubuntu0.2",
        "1.1.3-5ubuntu0.4",
        "1.1.3-5ubuntu0.5",
        "1.1.3-5ubuntu0.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          },
          {
            "binary_name": "libatopology2",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.2-2.1ubuntu2.5+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.9-0ubuntu1",
        "1.2.1.2-2ubuntu2",
        "1.2.2-2ubuntu1",
        "1.2.2-2.1",
        "1.2.2-2.1ubuntu1",
        "1.2.2-2.1ubuntu2",
        "1.2.2-2.1ubuntu2.1",
        "1.2.2-2.1ubuntu2.2",
        "1.2.2-2.1ubuntu2.3",
        "1.2.2-2.1ubuntu2.4",
        "1.2.2-2.1ubuntu2.5",
        "1.2.2-2.1ubuntu2.5+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.2.6.1-1ubuntu1.2"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.6.1-1ubuntu1.2"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.6.1-1ubuntu1.2"
          },
          {
            "binary_name": "libatopology2",
            "binary_version": "1.2.6.1-1ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.6.1-1ubuntu1.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.6.1-1ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.4-1.1ubuntu3",
        "1.2.4-1.1ubuntu4",
        "1.2.5.1-1ubuntu1",
        "1.2.6.1-1ubuntu1",
        "1.2.6.1-1ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.11-1ubuntu0.3"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.11-1ubuntu0.3"
          },
          {
            "binary_name": "libasound2t64",
            "binary_version": "1.2.11-1ubuntu0.3"
          },
          {
            "binary_name": "libatopology2t64",
            "binary_version": "1.2.11-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.11-1ubuntu0.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.11-1ubuntu0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.9-2",
        "1.2.10-1",
        "1.2.10-2",
        "1.2.10-3",
        "1.2.10-3build1",
        "1.2.11-1build1",
        "1.2.11-1build2",
        "1.2.11-1ubuntu0.1",
        "1.2.11-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.14-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.14-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2t64",
            "binary_version": "1.2.14-1ubuntu1.1"
          },
          {
            "binary_name": "libatopology2t64",
            "binary_version": "1.2.14-1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.14-1ubuntu1.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.13-1build1",
        "1.2.14-1",
        "1.2.14-1ubuntu1",
        "1.2.14-1ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.15.3-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.15.3-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2t64",
            "binary_version": "1.2.15.3-1ubuntu1.1"
          },
          {
            "binary_name": "libatopology2t64",
            "binary_version": "1.2.15.3-1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.15.3-1ubuntu1.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.15.3-1ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.14-1ubuntu1",
        "1.2.14-2ubuntu1",
        "1.2.15-2",
        "1.2.15.1-1",
        "1.2.15.3-1",
        "1.2.15.3-1build1",
        "1.2.15.3-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt memory by supplying maliciously crafted ALSA configuration text. When parsing nested compound or array configuration blocks, parse_def() fails to check return values before continuing, causing snd_config_delete() to be called twice on the same already-freed node, resulting in a NULL-pointer write or invalid memory read.",
  "id": "UBUNTU-CVE-2026-56109",
  "modified": "2026-07-14T18:51:07Z",
  "published": "2026-06-22T18:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56109"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-56109"
    },
    {
      "type": "REPORT",
      "url": "https://lore.kernel.org/alsa-devel/CAGt8pqBU0p2voB+qHxWGcNJrKHAcBhAyHUUBPLBN-Yj_SiV6MQ@mail.gmail.com/"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8538-1"
    }
  ],
  "related": [
    "USN-8538-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-56109"
  ]
}



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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

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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.
  • 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.