{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.2.16.1"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a7babcb8e6361719bf18fa96f11354d125447500"
            },
            {
              "fixed": "536dd6f8affdf5197c12a63a71c92a70b2833cc0"
            }
          ],
          "repo": "https://github.com/alsa-project/alsa-lib",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-415"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56109.json"
  },
  "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": "CVE-2026-56109",
  "modified": "2026-07-08T05:37:36.109588082Z",
  "published": "2026-06-22T15:58:42.404Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56109.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/alsa-project/alsa-lib/releases/tag/v1.2.16.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56109"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/alsa-library-double-free-via-parse-def-in-conf-c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/alsa-project/alsa-lib/commit/536dd6f8affdf5197c12a63a71c92a70b2833cc0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alsa-project/alsa-lib"
    },
    {
      "type": "EVIDENCE",
      "url": "https://lore.kernel.org/alsa-devel/CAGt8pqBU0p2voB+qHxWGcNJrKHAcBhAyHUUBPLBN-Yj_SiV6MQ@mail.gmail.com/"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "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"
    }
  ],
  "summary": "ALSA Library \u003c 1.2.16.1 Double-Free via parse_def() in conf.c"
}