CVE-2026-53209

Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend

EPSS 0.2%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

25 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

Affected products

Linux · Linux

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References

https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1 https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862 https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7d https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758 https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62 https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253