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CVE-2026-56109— ALSA Library < 1.2.16.1 Double-Free via parse_def() in conf.c

Quick assessment

Affected
alsa-project alsa-lib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

alsa-project alsa-lib是alsa-project组织开源的一个高级声音架构用户空间库。 Advanced Linux Sound Architecture project alsa-lib 1.2.16.1之前版本存在资源管理错误漏洞，该漏洞源于src/conf.c文件中的parse_def()函数存在双重释放漏洞，导致snd_config_delete()被对同一个已释放节点调用两次，可能导致空指针写入或无效内存读取。

CVSS 6.8 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
alsa-project alsa-lib < 1.2.16.1 affected
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I. Basic Information for CVE-2026-56109

Vulnerability Information
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Vulnerability Title
ALSA Library < 1.2.16.1 Double-Free via parse_def() in conf.c
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
Advanced Linux Sound Architecture project alsa-lib 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
alsa-project alsa-lib是alsa-project组织开源的一个高级声音架构用户空间库。 Advanced Linux Sound Architecture project alsa-lib 1.2.16.1之前版本存在资源管理错误漏洞，该漏洞源于src/conf.c文件中的parse_def()函数存在双重释放漏洞，导致snd_config_delete()被对同一个已释放节点调用两次，可能导致空指针写入或无效内存读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
alsa-project alsa-lib 0 ~ 1.2.16.1 -

II. Public POCs for CVE-2026-56109

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III. Intelligence Information for CVE-2026-56109

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Patches & Fixes for CVE-2026-56109 (1)

Vendor Advisories for CVE-2026-56109 (1)

Mailing List Discussions for CVE-2026-56109 (1)

Vendor Pages for CVE-2026-56109 (1)

IV. Related Vulnerabilities

Same product: alsa-lib
Same weakness: CWE-415

V. Comments for CVE-2026-56109

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