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CVE-2026-53209

Last refreshed2026-10-17

Status: UPDATED  |  Advisory ID: CVE-2026-53209

Key Details

CVECVE-2026-53209
CVSS Score / Version
7.8 (High) / CVSS v3.1
Updated2026-10-16
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Prose
attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
Linux Kernel
Classified as
CWE-787 (Out-of-bounds Write)

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
LinuxLinux Kernel
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-53209
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-53209

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