CVE-2026-56109: Double Free in alsa-project alsa-lib
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.
AI Analysis
Technical Summary
CVE-2026-56109 describes a double-free vulnerability in the Advanced Linux Sound Architecture (ALSA) library versions prior to 1.2.16.1. The issue arises in the parse_def() function within src/conf.c, where it improperly handles return values when parsing nested configuration blocks. This results in snd_config_delete() being invoked twice on the same already-freed node, causing memory corruption including NULL-pointer writes or invalid reads. The vulnerability has a CVSS 4.0 score of 7.0, indicating high severity, and does not require user interaction or privileges to be triggered locally. No official patch or remediation level is currently confirmed.
Potential Impact
Successful exploitation can lead to memory corruption in the ALSA library, potentially causing application crashes or undefined behavior. The vulnerability does not require privileges or user interaction but requires local access. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, avoid processing untrusted ALSA configuration files locally to reduce risk.
CVE-2026-56109: Double Free in alsa-project alsa-lib
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.
CVSS v4.0
Score 7.0high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56109 describes a double-free vulnerability in the Advanced Linux Sound Architecture (ALSA) library versions prior to 1.2.16.1. The issue arises in the parse_def() function within src/conf.c, where it improperly handles return values when parsing nested configuration blocks. This results in snd_config_delete() being invoked twice on the same already-freed node, causing memory corruption including NULL-pointer writes or invalid reads. The vulnerability has a CVSS 4.0 score of 7.0, indicating high severity, and does not require user interaction or privileges to be triggered locally. No official patch or remediation level is currently confirmed.
Potential Impact
Successful exploitation can lead to memory corruption in the ALSA library, potentially causing application crashes or undefined behavior. The vulnerability does not require privileges or user interaction but requires local access. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, avoid processing untrusted ALSA configuration files locally to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-18T19:15:10.650Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39735deed863c81e3962fc
Added to database: 06/22/2026, 17:39:41 UTC
Last enriched: 07/15/2026, 10:13:27 UTC
Last updated: 08/05/2026, 23:19:38 UTC
Views: 70
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