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CVE-2026-53276

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer In iso_sock_rebind_bc(), the bis pointer is cached, then the socke…

Published Jun 25, 2026CWE-416EPSS 0.11%

Overview

CVE-2026-53276 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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: ISO: Fix a use-after-free of the hci_conn pointer

In iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is

dropped:

bis = iso_pi(sk)->conn->hcon;

/* Release the socket before lookups since that requires hci_dev_lock

* which shall not be acquired while holding sock_lock for proper

* ordering.

*/

release_sock(sk);

hci_dev_lock(bis->hdev);

During the unlocked window, could a concurrent close() destroy the connection

and free the bis structure, causing hci_dev_lock(bis->hdev) to access memory

after it is freed, fix this by using the hdev reference which was safely

acquired via iso_conn_get_hdev().

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/d324b8aa20bd3c3394e3647dc22491d88f3f4e7aRefgit.kernel.org/stable/c/f50331f2a1441ec49988832c3a95f2edacc47322

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53276?

CVE-2026-53276 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53276?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53276?

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-2026-53276?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53276 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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