High 7.8Published Jun 25, 2026

CVE-2026-53209Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend

Updated under an hour ago (Oct 26, 2026, 6:23 PM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	63f365eb4d1668a04070151b555d55a07ede8d4b builds before 10b0e832cc05d7aef4b92bed912cbd4a395d0862; from c621211b308816889f0a3246de448bfcef8ab3ab before 1338ee049a8910ba6c9cee963920e978e6893c7d; 907ef6e12fb558a0763e894311eb245a94c192dd builds before 02f50e8bb69f9b22516163a09922f5537d3b12d1; from 5725bc608252050ed8a4d47d59225b7dd73474c8 before dafc9f57140e66a10945127aa7433c3d715dc253; from 5725bc608252050ed8a4d47d59225b7dd73474c8 before cdd8bbdbee763fdf5bf343e6f7d4e79347739f62; 5725bc608252050ed8a4d47d59225b7dd73474c8 builds before 5c65b96b549ea2dcfde497436bf9e048deb87758; 15da883c010cbc2a84aec1738b6ad6ee477846de; from 6.1.142 before 6.1.176; and 3 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 6.1.142 before 6.1.176; from 6.6.94 before 6.6.143; from 6.12.34 before 6.12.94; from 6.15.3 before 6.16; from 6.16.1 before 6.18.36; from 6.19 before 7.0.13; 6.16; 6.16; and 11 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.