CVE-2026-53209
HIGH 7.8In 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.
Severe if exploited (CVSS 7.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 4th percentile
Impact if exploited
7.8CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Weakness (CWE)
Not classified.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
Technical & other
- https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862
- https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7d
- https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1
- https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253
- https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62
- https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758