{"id":"UBUNTU-CVE-2026-56109","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.","modified":"2026-07-14T23:30:16.849875627Z","published":"2026-06-22T18:16:00Z","related":["USN-8538-1"],"upstream":["CVE-2026-56109"],"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"}],"affected":[{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"1.0.27.2-3ubuntu7"},{"binary_name":"libasound2-data","binary_version":"1.0.27.2-3ubuntu7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.29-0ubuntu1","1.1.0-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.0-0ubuntu1","binary_name":"libasound2"},{"binary_version":"1.1.0-0ubuntu1","binary_name":"libasound2-data"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"1.1.3-5ubuntu0.6","binary_name":"libasound2"},{"binary_name":"libasound2-data","binary_version":"1.1.3-5ubuntu0.6"},{"binary_version":"1.1.3-5ubuntu0.6","binary_name":"libasound2-plugin-smixer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":{"binaries":[{"binary_version":"1.2.2-2.1ubuntu2.5+esm1","binary_name":"libasound2"},{"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_version":"1.2.2-2.1ubuntu2.5+esm1","binary_name":"libatopology2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.6.1-1ubuntu1.2"}]}],"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":{"binaries":[{"binary_name":"libasound2","binary_version":"1.2.6.1-1ubuntu1.2"},{"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"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.11-1ubuntu0.3"}]}],"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":{"availability":"No subscription required","binaries":[{"binary_version":"1.2.11-1ubuntu0.3","binary_name":"libasound2-data"},{"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.13-1build1","1.2.14-1","1.2.14-1ubuntu1","1.2.14-1ubuntu1.1"],"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_version":"1.2.14-1ubuntu1.1","binary_name":"libatopology2t64"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56109.json"}},{"package":{"name":"alsa-lib","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/alsa-lib?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.15.3-1ubuntu1.1"}]}],"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"],"ecosystem_specific":{"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"}],"availability":"No 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