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
Trending — 4 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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
6.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. 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 / EcosystemFixed in / 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 rangeFixed inDependents
alsa-lib1.2.10-1 ... 1.2.9-2 (29 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
alsa-lib1.2.10-1 ... 1.2.9-2 (22 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
alsa-lib1.2.14-1 ... 1.2.16.1-1~bpo13+1 (10 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
alsa-lib1.2.14-1 ... 1.2.16.1-1~bpo13+1 (8 versions)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 12× in last 7d / 43× 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 210 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 96.4% of all scored CVEs.
What is the CVSS score of CVE-2026-56109?
CVE-2026-56109 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-56109?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56109, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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