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
3%
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 (1.2.11-1ubuntu0.3) @ noble2026-08-24ubuntu
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 20× in last 7d / 101× 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 183 total refreshes for this CVE.

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

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 96.6% 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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