Linux Kernel Bluetooth stack Out-Of-Bounds Read Rated 8.1 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-53254

Key Details

CVE	CVE-2026-53254
CVSS Score / Version	8.1 (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:N/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 none; availability impact is high.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classified as	CWE-125 (Out-of-bounds Read)
Exploitation prediction (EPSS)	0.27% probability of exploitation in the next 30 days (18% 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: RFCOMM: validate skb length in MCC handlers

The RFCOMM MCC handlers cast skb->data to protocol-specific structs

without validating skb->len first. A malicious remote device can send

truncated MCC frames and trigger out-of-bounds reads in these handlers.

Fix this by using skb_pull_data() to validate and access the required

data before dereferencing it.

rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows

1-byte RPN requests. Handle this by validating only the DLCI byte first,

and validating the full struct only when len > 1. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-53254
CVE	https://www.cve.org/CVERecord?id=CVE-2026-53254

Source

Reference

NVD

CVE