Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-25T00:00:00 kernel: Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-131

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend Existing advertising instances can already hold the maximum extended advertising payload. When hci_adv_bcast_annoucement() prepends the Broadcast Announcement service data to that payload, the combined data may no longer fit in the temporary buffer used to rebuild the advertising data. Reject that case before copying the existing payload and report the failure through the device log. This keeps the existing advertising data intact and avoids overrunning the temporary buffer.

A flaw was found in the Bluetooth subsystem of the Linux kernel, specifically within the `hci_sync` component. This vulnerability occurs when the `hci_adv_bcast_annoucement()` function attempts to prepend Broadcast Announcement service data to an existing advertising payload that is already at its maximum size. This can lead to an oversized data packet that may overrun a temporary buffer, potentially causing a denial of service (DoS) or other unpredictable system behavior.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53209 https://nvd.nist.gov/vuln/detail/CVE-2026-53209 https://lore.kernel.org/linux-cve-announce/2026062502-CVE-2026-53209-92bf@gregkh/T