CVE-2026-89736

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89736

Key Details

CVE	CVE-2026-89736
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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

usb: gadget: u_audio: Fix use-after-free on sound card disconnect

g_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound

card teardown and immediately frees the underlying struct snd_uac_chip

context. However, snd_card_free_when_closed() returns asynchronously

while ALSA control elements (kctls) remain open in userspace.

When userspace control applications access or close these open file

descriptors, kctl callbacks attempt to dereference kctl->private_data

pointing to &uac->c_prm or &uac->p_prm within the freed uac structure,

resulting in a use-after-free (UAF) memory corruption.

Fix this issue by deferring the destruction of struct snd_uac_chip until

all references to the ALSA sound card are released. Register a custom

card->private_free callback (u_audio_card_free) during g_audio_setup()

that frees uac and its associated playback/capture request and ring

buffers only when the sound card reference count drops to zero. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89736
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89736

Source

Reference

NVD

CVE