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Vulnerability record · CVE-2026-53209 · published 25 June 2026

CVE-2026-53209: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
2 Jul 2026Last modified by NVD

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/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-53209), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.