CVE-2026-53996

HIGHPre-NVD 7.07.0—
EchelonGraph scoreHIGH confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2026-08-12. the CNA's CVSS baseline 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: None knownExposed: 0

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

NetBSD's hdaudio(4) driver in sys/dev/hdaudio/hdaudio.c contains a missing access control vulnerability that allows unprivileged local attackers to invoke the HDAUDIO_FGRP_SETCONFIG ioctl without elevated permissions by exploiting the absence of an access check on /dev/hdaudioN device nodes. Attackers can repeatedly issue HDAUDIO_FGRP_SETCONFIG from one thread while keeping DMA and IRQs live from a second thread to trigger a use-after-free race condition in hdafg_detach() between stream_stop() and stream_disestablish(), where a latched DMA interrupt dereferences a freed callback pointer, resulting in outcomes ranging from audio-subsystem denial of service and kernel panic to potential local kernel privilege escalation.

CVSS v3
7.0
EG Score
7.0(high)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity70% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 14, 2026

Advisory Details (3)

Auto-updated Aug 12, 2026
No patch confirmed yet.
generic

NetBSD hdaudio(4) Driver Privilege Bypass Use-After-Free via HDAUDIO_FGRP_SETCONFIG ioctl | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netbsd-hdaudio-4-driver-privilege-bypass-use-after-free-via-hdaudio-fgrp-setconfig-ioctl
generic

CVS log for src/sys/dev/hdaudio/hdaudio.c

https://cvsweb.NetBSD.org/bsdweb.cgi/src/sys/dev/hdaudio/hdaudio.c
generic

hdaudio UAF · GitHub

https://gist.github.com/n4sm/c9683ca728ecfada6c726f2a5afb50ed

Vendor Advisories for CVE-2026-53996(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 26× in last 7d / 38× 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.

  1. 2026-08-21 05:19 UTCEG score recompute
  2. 2026-08-21 05:19 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 16:25 UTCGHSA enrichment
  5. 2026-08-20 03:31 UTCEG score recompute
  6. 2026-08-20 03:31 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 14:36 UTCGHSA enrichment
  9. 2026-08-19 01:39 UTCGHSA enrichment
  10. 2026-08-18 12:45 UTCGHSA enrichment
  11. 2026-08-17 23:21 UTCEG score recompute
  12. 2026-08-17 23:21 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 10:26 UTCGHSA enrichment
  15. 2026-08-16 21:32 UTCEG score recompute
  16. 2026-08-16 21:32 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 08:38 UTCEG score recompute
  19. 2026-08-16 08:38 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 19:44 UTCGHSA enrichment
  22. 2026-08-15 06:50 UTCEG score recompute
  23. 2026-08-15 06:50 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 17:09 UTCEG score recompute
Show 13 more
  1. 2026-08-14 17:09 UTCGHSA enrichment
  2. 2026-08-14 07:17 UTCEG score recompute
  3. 2026-08-14 07:17 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 18:23 UTCGHSA enrichment
  6. 2026-08-13 05:28 UTCGHSA enrichment
  7. 2026-08-12 16:34 UTCEG score recompute
  8. 2026-08-12 16:34 UTCGHSA enrichment
  9. 2026-08-12 15:37 UTCEG score recompute
  10. 2026-08-12 15:36 UTCGHSA enrichment
  11. 2026-08-12 13:37 UTCEG score recompute
  12. 2026-08-12 12:55 UTCEG score recompute
  13. 2026-08-12 12:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-53996?
CVE-2026-53996 is a high vulnerability published on August 12, 2026. NetBSD's hdaudio(4) driver in sys/dev/hdaudio/hdaudio.c contains a missing access control vulnerability that allows unprivileged local attackers to invoke the HDAUDIOFGRPSETCONFIG ioctl without elevated permissions by exploiting the absence of an access check on /dev/hdaudioN device nodes.…
When was CVE-2026-53996 disclosed?
CVE-2026-53996 was first published in the National Vulnerability Database on August 12, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53996 actively exploited?
CVE-2026-53996 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 99.3% of all scored CVEs.
What is the CVSS score of CVE-2026-53996?
CVE-2026-53996 has a CVSS v4.0 base score of 7.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-53996?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53996, 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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