CVE-2026-52918
Received Received - Intake
Bluetooth Serialization Flaw in Linux Kernel

Publication date: 2026-06-24

Last updated on: 2026-06-24

Assigner: kernel.org

Description
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.
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Meta Information
Published
2026-06-24
Last Modified
2026-06-24
Generated
2026-06-24
AI Q&A
2026-06-24
EPSS Evaluated
N/A
NVD
CVE-2026-52918
EUVD
EUVD-2026-38721
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's Bluetooth subsystem. Specifically, the function bt_sock_poll() accesses the accept queue without proper synchronization. During this unsynchronized access, a child socket can be removed and its last reference dropped, leading to potential issues. The vulnerability has existed since the initial Bluetooth import into the kernel.

The fix involves protecting the accept queue (accept_q) with a dedicated lock to ensure safe updates and polling. Additionally, the bt_accept_dequeue() function was reworked to take temporary references to child sockets under the queue lock before releasing it and locking the child socket.

Mitigation Strategies

The vulnerability in the Linux kernel Bluetooth subsystem involves unsynchronized access to the accept queue. To mitigate this vulnerability, ensure your Linux kernel is updated to a version where this issue has been resolved.

  • Update the Linux kernel to the latest version that includes the fix for serializing accept_q access.
  • Apply any vendor-provided patches or security updates related to Bluetooth socket handling.
  • Restart Bluetooth services or the system after applying updates to ensure the fix is active.
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