CVE-2026-53209high

CVE-2026-53209: high-severity vulnerability in Linux

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend

Published · Updated

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.8epss 0.1%
exploitation probability
0.1%top 98% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7dhttps://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253