CVE-2026-74531

Received Received - Intake

Bluetooth Use-After-Free in Linux Kernel

Publication date: 2026-08-15

Last updated on: 2026-08-23

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: hold conn reference in abort_conn_sync() There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-15

Last Modified

2026-08-23

Generated

2026-09-04

AI Q&A

2026-08-15

EPSS Evaluated

2026-09-03

NVD

CVE-2026-74531

EUVD

EUVD-2026-59724

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a theoretical Use-After-Free (UAF) vulnerability in the Linux kernel's Bluetooth subsystem. It occurs when a Bluetooth connection reference is freed while a synchronization task is still running, potentially allowing the freed memory to be accessed improperly.

Detection Guidance

This vulnerability involves a potential use-after-free (UAF) condition in the Linux kernel's Bluetooth subsystem. Detection requires checking for kernel logs or crashes related to Bluetooth operations, particularly during connection aborts. Monitor for kernel oops messages or system crashes when Bluetooth devices disconnect unexpectedly.

Impact Analysis

If exploited, this could lead to system crashes, privilege escalation, or unauthorized memory access. However, it requires specific timing conditions and is theoretical, meaning real-world impact depends on kernel version and configuration.

Compliance Impact

This vulnerability is a theoretical use-after-free (UAF) condition in the Linux kernel's Bluetooth subsystem. It does not directly impact compliance with standards like GDPR or HIPAA, as those focus on data protection and privacy rather than kernel-level memory safety issues.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the Bluetooth hci_conn UAF vulnerability. Monitor kernel security advisories for updates.

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