CVE-2026-53209
Last modified
CVE-2026-53209 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.14% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 6.1.142, < 6.1.176 | — |
| Linux | Linux Kernel | >= 6.6.94, < 6.6.143 | — |
| Linux | Linux Kernel | >= 6.12.34, < 6.12.94 | — |
| Linux | Linux Kernel | >= 6.15.3, < 6.16 | — |
| Linux | Linux Kernel | >= 6.16.1, < 6.18.36 | — |
| Linux | Linux Kernel | >= 6.19, < 7.0.13 | — |
| Linux | Linux Kernel | 6.16 | — |
| Linux | Linux Kernel | 7.1 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-53209?
How severe is CVE-2026-53209?
How do I fix CVE-2026-53209?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-53203In the Linux kernel, the following vulnerability has been re…7.1
- CVE-2026-53204In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-53205In the Linux kernel, the following vulnerability has been re…7.1
- CVE-2026-53206In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-53207In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-53208In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-5321A flaw has been found in vanna-ai vanna up to 2.0.2. Affecte…4.3
- CVE-2026-53210In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-53211In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-53212In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-53213In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-53214In the Linux kernel, the following vulnerability has been re…5.5
Are you affected by CVE-2026-53209?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST