The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free...
Summary
Vulnerability reported (CVE-2026-56109). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-56109 has been found.
Risk of unauthorized operations or information disclosure. CVSS score: 6.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-56109" on the vendor's site.
CVE-2026-56109 — CWE-415 / CVSS v3 6.8
Attack vector: local / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-415) has been reported.
Check the vendor advisory for the affected versions.
Severity: Medium (CVSS 6.8/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-56109 alsa-lib Fixed in: 1.2.8-r2
- Debian DEBIAN-CVE-2026-56109 alsa-lib
- Ubuntu UBUNTU-CVE-2026-56109 alsa-lib
References
- advisory nvd.nist.gov
- advisory github.com
- advisory vulncheck.com
- advisory github.com
- package github.com
- patch github.com
- report lore.kernel.org
- web lore.kernel.org
- web github.com