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CVE-2026-53252

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu…

Published Jun 25, 2026CWE-401EPSS 0.13%

Overview

CVE-2026-53252 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

Bluetooth: fix memory leak in error path of hci_alloc_dev()

Early failures in Bluetooth HCI UART configuration leak SRCU percpu

memory.

When device initialization fails before hci_register_dev() completes,

the HCI_UNREGISTER flag is never set. As a result, when the device

reference count reaches zero, bt_host_release() evaluates this flag as

false and falls back to a direct kfree(hdev).

Because hci_release_dev() is bypassed, the SRCU struct initialized

early in hci_alloc_dev() is never cleaned up, resulting in a leak of

percpu memory.

Fix the leak by explicitly calling cleanup_srcu_struct() in the

fallback (unregistered) branch of bt_host_release() before freeing

the device.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184Refgit.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37fRefgit.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fdRefgit.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309Refgit.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aaRefgit.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889Refgit.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53252?

CVE-2026-53252 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-53252?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53252?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53252?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53252 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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