{"id":"CVE-2026-53996","title":"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 ab…","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 ab…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-862"],"published":"2026-08-12","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:30:35.900","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53996","references":[{"url":"https://cvsweb.NetBSD.org/bsdweb.cgi/src/sys/dev/hdaudio/hdaudio.c","label":"disclosure@vulncheck.com"},{"url":"https://gist.github.com/n4sm/c9683ca728ecfada6c726f2a5afb50ed","label":"disclosure@vulncheck.com"},{"url":"https://gnats.netbsd.org/60492","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/netbsd-hdaudio-4-driver-privilege-bypass-use-after-free-via-hdaudio-fgrp-setconfig-ioctl","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00128,"epssPercentile":0.02056,"ingestedAt":"2026-09-24T20:51:40.198Z","slug":"CVE-2026-53996","body":"## Overview\n\nNetBSD'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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}