CVE-2026-53209 — Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend Existing advertising instances can alr…
Published: 2026-06-25 · CVSS: 7.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7