CVE-2026-43437

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain()

In the drain loop, the local variable 'runtime' is reassigned to a linked stream's runtime (runtime = s->runtime at line 2157). After releasing the stream lock at line 2169, the code accesses runtime->no_period_wakeup, runtime->rate, and runtime->buffer_size (lines 2170-2178) — all referencing the linked stream's runtime without any lock or refcount protecting its lifetime.

A concurrent close() on the linked stream's fd triggers snd_pcm_release_substream() → snd_pcm_drop() → pcm_release_private() → snd_pcm_unlink() → snd_pcm_detach_substream() → kfree(runtime). No synchronization prevents kfree(runtime) from completing while the drain path dereferences the stale pointer.

Fix by caching the needed runtime fields (no_period_wakeup, rate, buffer_size) into local variables while still holding the stream lock, and using the cached values after the lock is released.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
2.7%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 21, 2026

Advisory Details (7)

Auto-updated May 11, 2026
No patch confirmed yet.
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc71f888994569f87d5bee20b1ac6c9c1e3a7a79
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9baee36e8c5443411c4629afabafaff8a46a23fd
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/629cf09464cf98670996ea5c191dc9743e6f3f00
generic

ALSA: pcm: fix use-after-free on linked stream runtime in snd_pcm_drain() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4a758e9a1f5ed722f83c4dd35f867fe811553bcb

Vendor Advisories for CVE-2026-43437(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 40× 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 133 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43437?
CVE-2026-43437 is a high vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: fix use-after-free on linked stream runtime in sndpcmdrain() In the drain loop, the local variable 'runtime' is reassigned to a linked stream's runtime (runtime = s->runtime at line 2157). After releasing the stream lock…
When was CVE-2026-43437 disclosed?
CVE-2026-43437 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43437 actively exploited?
CVE-2026-43437 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43437?
CVE-2026-43437 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43437?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43437, 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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