CVE-2026-74533

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-74533

Key Details

CVE	CVE-2026-74533
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is adjacent; attack complexity is low; privileges required is none; 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:

Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero

hci_conn::iso_data is accessed and modified without lock or RCU.

This leads to a race

[Task hdev->workqueue] [Task 2]

iso_recv iso_conn_put(conn)

conn = LOAD hcon->iso_data iso_conn_free(conn)

iso_conn_hold_unless_zero(conn) hcon->iso_data = NULL

kfree(conn)

kref_get_unless_zero(&conn->ref) /* UAF */

and also to races in iso_conn_add() vs. iso_conn_free().

Fix by adding spinlock hci_conn::proto_lock and using it to guard

hci_conn::iso_data. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74533
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74533

Source

Reference

NVD

CVE