Linux Kernel Bluetooth stack Use-After-Free Rated 8.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-46056

Key Details

CVE	CVE-2026-46056
CVSS Score / Version	8.8 (High) / CVSS v3.1
Updated	2026-10-15
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 and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classified as	CWE-416 (Use After Free)
Exploitation prediction (EPSS)	0.28% probability of exploitation in the next 30 days (19% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Subsystems	Controllers & Field I/O, OT Supporting Infrastructure
Sectors	All Sectors

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

Bluetooth: hci_event: fix potential UAF in SSP passkey handlers

hci_conn lookup and field access must be covered by hdev lock in

hci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise

the connection can be freed concurrently.

Extend the hci_dev_lock critical section to cover all conn usage in both

handlers.

Keep the existing keypress notification behavior unchanged by routing

the early exits through a common unlock path. (NVD)

Monitor Linux's and Siemens's web pages for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46056
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46056

Source

Reference

NVD

CVE