CVE-2026-53209
Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend
Description
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.
INFO
Published Date :
June 25, 2026, 9:16 a.m.
Last Modified :
July 2, 2026, 8:54 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply kernel patches for Bluetooth HCI sync.
- Update Linux kernel to resolved version.
- Reject oversized Broadcast Announcement data.
- Log any reported failures.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53209.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53209 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53209
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53209 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53209 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jul. 02, 2026
Action Type Old Value New Value Added CWE CWE-787 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.16:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.142 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12.34 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.15.3 up to (excluding) 6.16 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.16.1 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.94 up to (excluding) 6.6.143 Added Reference Type kernel.org: https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '63f365eb4d1668a04070151b555d55a07ede8d4b', 'lessThan': '10b0e832cc05d7aef4b92bed912cbd4a395d0862', 'versionType': 'git'}, {'status': 'affected', 'version': 'c621211b308816889f0a3246de448bfcef8ab3ab', 'lessThan': '1338ee049a8910ba6c9cee963920e978e6893c7d', 'versionType': 'git'}, {'status': 'affected', 'version': '907ef6e12fb558a0763e894311eb245a94c192dd', 'lessThan': '02f50e8bb69f9b22516163a09922f5537d3b12d1', 'versionType': 'git'}, {'status': 'affected', 'version': '5725bc608252050ed8a4d47d59225b7dd73474c8', 'lessThan': 'dafc9f57140e66a10945127aa7433c3d715dc253', 'versionType': 'git'}, {'status': 'affected', 'version': '5725bc608252050ed8a4d47d59225b7dd73474c8', 'lessThan': 'cdd8bbdbee763fdf5bf343e6f7d4e79347739f62', 'versionType': 'git'}, {'status': 'affected', 'version': '5725bc608252050ed8a4d47d59225b7dd73474c8', 'lessThan': '5c65b96b549ea2dcfde497436bf9e048deb87758', 'versionType': 'git'}, {'status': 'affected', 'version': '15da883c010cbc2a84aec1738b6ad6ee477846de', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.142', 'lessThan': '6.1.176', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.94', 'lessThan': '6.6.143', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.34', 'lessThan': '6.12.94', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.15.3', 'lessThan': '6.16', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1 Added Reference https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862 Added Reference https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7d Added Reference https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758 Added Reference https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62 Added Reference https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253