CVE-2026-53209
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/02f50e8bb69f9b22516163a09922f5537d3b12d1Patch
- https://git.kernel.org/stable/c/10b0e832cc05d7aef4b92bed912cbd4a395d0862Patch
- https://git.kernel.org/stable/c/1338ee049a8910ba6c9cee963920e978e6893c7dPatch
- https://git.kernel.org/stable/c/5c65b96b549ea2dcfde497436bf9e048deb87758Patch
- https://git.kernel.org/stable/c/cdd8bbdbee763fdf5bf343e6f7d4e79347739f62Patch
- https://git.kernel.org/stable/c/dafc9f57140e66a10945127aa7433c3d715dc253Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.