CVE-2026-56109

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit.
generic

ALSA Library < 1.2.16.1 Double-Free via parse_def() in conf.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/alsa-library-double-free-via-parse-def-in-conf-c
generic🟡 PoC Available

Security: double-free / invalid pointer dereference in alsa-lib config parser (`parse_def`) via crafted configuration text - Luigino Camastra

https://lore.kernel.org/alsa-devel/CAGt8pqBU0p2voB+qHxWGcNJrKHAcBhAyHUUBPLBN-Yj_SiV6MQ@mail.gmail.com/
github_commit

commit 536dd6f8affd (alsa-project/alsa-lib)

Fix landed in alsa-project/alsa-lib commit 536dd6f8affd — awaiting tagged release

https://github.com/alsa-project/alsa-lib/commit/536dd6f8affdf5197c12a63a71c92a70b2833cc0

Vendor Advisories for CVE-2026-56109(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibatopology2t64 (1.2.15.3-1ubuntu1.1) @ resolute2026-09-18ubuntu
redhatalsa-lib-main-1.2.16.1-2.hum12026-07-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
alsa-lib1.2.10-1 ... 1.2.9-2 (29 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
alsa-lib1.2.10-1 ... 1.2.9-2 (23 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
alsa-lib1.2.14-1 ... 1.2.16.1-2 (11 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
alsa-lib1.2.14-1 ... 1.2.16.1-1~bpo13+1 (8 versions)
  • every version up to 1.2.16.1-1: fixed in 1.2.16.1-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 228 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-08 05:24 UTCOSV refresh
  5. 2026-10-07 23:48 UTCEPSS rescore
  6. 2026-10-06 15:18 UTCEPSS rescore
  7. 2026-10-05 17:43 UTCEPSS rescore
  8. 2026-10-04 23:22 UTCEPSS rescore
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-02 17:56 UTCEPSS rescore
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-09-30 15:03 UTCEPSS rescore
  13. 2026-09-29 15:22 UTCEPSS rescore
  14. 2026-09-28 13:51 UTCEPSS rescore
  15. 2026-09-27 13:48 UTCEPSS rescore
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-18 11:15 UTCEG score recompute
  21. 2026-09-18 11:15 UTCVendor advisory
  22. 2026-09-18 11:15 UTCGHSA enrichment
  23. 2026-09-17 19:31 UTCEPSS rescore
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 75 more
  1. 2026-09-15 03:11 UTCEPSS rescore
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-13 12:32 UTCEG score recompute
  4. 2026-09-13 12:32 UTCVendor advisory
  5. 2026-09-13 12:31 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-10 09:35 UTCEPSS rescore
  8. 2026-09-08 22:01 UTCEPSS rescore
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-04 05:07 UTCEPSS rescore
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-08-30 20:33 UTCEG score recompute
  15. 2026-08-30 20:33 UTCVendor advisory
  16. 2026-08-30 20:32 UTCGHSA enrichment
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-28 21:41 UTCEPSS rescore
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-25 13:49 UTCEPSS rescore
  23. 2026-08-24 13:56 UTCEG score recompute
  24. 2026-08-24 13:56 UTCVendor advisory
  25. 2026-08-24 13:56 UTCGHSA enrichment
  26. 2026-08-23 13:28 UTCEG score recompute
  27. 2026-08-23 13:28 UTCVendor advisory
  28. 2026-08-23 13:28 UTCGHSA enrichment
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-22 15:10 UTCEG score recompute
  31. 2026-08-22 15:10 UTCVendor advisory
  32. 2026-08-22 15:10 UTCGHSA enrichment
  33. 2026-08-21 23:49 UTCEPSS rescore
  34. 2026-08-21 05:56 UTCEG score recompute
  35. 2026-08-21 05:56 UTCVendor advisory
  36. 2026-08-21 05:56 UTCGHSA enrichment
  37. 2026-08-20 22:55 UTCEPSS rescore
  38. 2026-08-20 07:51 UTCEG score recompute
  39. 2026-08-20 07:51 UTCVendor advisory
  40. 2026-08-20 07:51 UTCGHSA enrichment
  41. 2026-08-19 17:04 UTCEPSS rescore
  42. 2026-08-19 04:52 UTCEG score recompute
  43. 2026-08-19 04:52 UTCVendor advisory
  44. 2026-08-19 04:52 UTCGHSA enrichment
  45. 2026-08-18 13:48 UTCEPSS rescore
  46. 2026-08-17 13:47 UTCEPSS rescore
  47. 2026-08-16 20:15 UTCEG score recompute
  48. 2026-08-16 20:15 UTCVendor advisory
  49. 2026-08-16 20:15 UTCGHSA enrichment
  50. 2026-08-16 14:56 UTCEPSS rescore
  51. 2026-08-16 02:14 UTCEPSS rescore
  52. 2026-08-15 21:11 UTCEG score recompute
  53. 2026-08-15 21:11 UTCVendor advisory
  54. 2026-08-15 21:11 UTCGHSA enrichment
  55. 2026-08-15 01:30 UTCEPSS rescore
  56. 2026-08-14 23:03 UTCVendor advisory
  57. 2026-08-14 23:03 UTCGHSA enrichment
  58. 2026-08-14 00:58 UTCEG score recompute
  59. 2026-08-14 00:58 UTCVendor advisory
  60. 2026-08-14 00:58 UTCGHSA enrichment
  61. 2026-08-13 22:00 UTCEPSS rescore
  62. 2026-08-13 02:53 UTCEG score recompute
  63. 2026-08-13 02:53 UTCVendor advisory
  64. 2026-08-13 02:53 UTCGHSA enrichment
  65. 2026-08-12 13:51 UTCEPSS rescore
  66. 2026-08-12 04:48 UTCEG score recompute
  67. 2026-08-12 04:48 UTCVendor advisory
  68. 2026-08-12 04:48 UTCGHSA enrichment
  69. 2026-08-11 06:25 UTCEG score recompute
  70. 2026-08-11 06:25 UTCVendor advisory
  71. 2026-08-11 06:25 UTCGHSA enrichment
  72. 2026-08-11 00:00 UTCEPSS rescore
  73. 2026-08-10 08:19 UTCEG score recompute
  74. 2026-08-10 08:19 UTCVendor advisory
  75. 2026-08-10 08:19 UTCGHSA enrichment

Related CVEs(same product + same vendor + same CWE)

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redhat:RHSA-2026:40573

Frequently asked(5)

What is CVE-2026-56109?
CVE-2026-56109 is a medium vulnerability published on June 22, 2026. The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parsedef() 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,…
When was CVE-2026-56109 disclosed?
CVE-2026-56109 was first published on June 22, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56109 actively exploited?
CVE-2026-56109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56109?
CVE-2026-56109 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56109?
A fix for CVE-2026-56109 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56109 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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