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Advisory severityMedium5.5Vendor: LowRed Hat Linux

Medium [CVE-2026-53364] Fix memory leak in hci_le_big_terminate

This medium-severity Red Hat Linux advisory covers CVE-2026-53364 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-53364 Source published Source updated

VulniPulse record published Record updated

CVE-2026-53364
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: Fix memory leak in hci_le_big_terminate() hci_le_big_terminate() allocates iso_list_data via kzalloc_obj but returns 0 without freeing it when neither pa_sync_term nor big_sync_term flags are set after evaluating the PA and BIG sync connection state.

This early-return path was introduced when hci_le_big_terminate() was refactored to take struct hci_conn instead of raw u8 parameters, adding PA/BIG flag evaluation logic. The existing kfree() on hci_cmd_sync_queue failure does not cover this path.

A flaw was found in the Linux kernel's Bluetooth Host Controller Interface (HCI) connection handling. The `hci_le_big_terminate()` function, which is responsible for terminating Bluetooth connections, allocates memory but fails to free it under specific conditions when certain flags are not set.

This memory leak could lead to resource exhaustion, potentially resulting in a denial of service (DoS). Red Hat severity: Low — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-772. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.

Red Hat does not currently list a fixing RHSA for this CVE.

Affected products named by the advisory: Red Hat package: kernel.

Is CVE-2026-53364 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53364 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-53364?

The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · medium-confidence parse· fetched 5 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 5 days ago·verify at source

Mitigation

The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 5 days ago·verify at source

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