Linux Kernel Bluetooth stack Vulnerability Rated 8.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-52918

Key Details

CVE	CVE-2026-52918
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
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: serialize accept_q access

bt_sock_poll() walks the accept queue without synchronization, while

child teardown can unlink the same socket and drop its last reference.

The unsynchronized accept queue walk has existed since the initial

Bluetooth import.

Protect accept_q with a dedicated lock for queue updates and polling.

Also rework bt_accept_dequeue() to take temporary child references under

the queue lock before dropping it and locking the child socket. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-52918
CVE	https://www.cve.org/CVERecord?id=CVE-2026-52918

Source

Reference

NVD

CVE