CVE-2026-56109

Local memory corruption via configuration parser double free

Published Jun 22, 2026 · Updated Jun 22, 2026

Double free in ALSA Library before 1.2.16.1 allows local users to corrupt process memory via crafted ALSA configuration text. In src/conf.c, parse_def() continues after an unchecked input failure while parsing nested compound or array blocks, so snd_config_delete() frees the same node twice. A target process must parse attacker-controlled configuration text; documented outcomes include a NULL-pointer write, invalid memory read, or process crash.

CVSS severity7.0
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in ALSA Library before 1.2.16.1 allows local users to corrupt process memory via crafted ALSA configuration text. In src/conf.c, parse_def() continues after an unchecked input failure while parsing nested compound or array blocks, so snd_config_delete() frees the same node twice. A target process must parse attacker-controlled configuration text; documented outcomes include a NULL-pointer write, invalid memory read, or process crash.

The record

CVE
CVE-2026-56109
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Advanced Linux Sound Architecture (ALSA) Project
Product
ALSA Library
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.2.16.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Advanced Linux Sound Architecture (ALSA) Project · ALSA Libraryversion=0 <1.2.16.1

Published CVSS scores

7.0VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
6.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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