CVE-2026-53996 (GCVE-0-2026-53996)
Vulnerability from cvelistv5 – Published: 2026-08-12 12:42 – Updated: 2026-08-14 16:50
VLAI
EPSS
VEX
Title
NetBSD hdaudio(4) Driver Privilege Bypass Use-After-Free via HDAUDIO_FGRP_SETCONFIG ioctl
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 15:24 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://gist.github.com/n4sm/c9683ca728ecfada6c72… | technical-description |
| https://gnats.netbsd.org/60492 | issue-tracking |
| https://cvsweb.NetBSD.org/bsdweb.cgi/src/sys/dev/… | patch |
| https://www.vulncheck.com/advisories/netbsd-hdaud… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
0 , ≤ 11
(custom)
cpe:2.3:o:netbsd:netbsd:*:*:*:*:*:*:*:* |
Date Public
2026-08-12 00:00
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