---
title: "CVE-2026-90091: Linux Kernel Bluetooth L2CAP - Race Condition"
description: "Linux kernel Bluetooth L2CAP contains a race condition caused by unsafe lockless read in l2cap_sock_cleanup_listen() accessing l2cap_pi(sk)->chan concurrently with l2cap_sock_kill(), letting attackers cause null pointer dereference and potential denial of service, exploit requires concurrent socket operations."
url: https://panop.io/threat-heartbeat/CVE-2026-90091/
---

# CVE-2026-90091 Linux Kernel Bluetooth L2CAP - Race Condition

Linux kernel Bluetooth L2CAP contains a race condition caused by unsafe lockless read in l2cap\_sock\_cleanup\_listen() accessing l2cap\_pi(sk)->chan concurrently with l2cap\_sock\_kill(), letting attackers cause null pointer dereference and potential denial of service, exploit requires concurrent socket operations.

CVSS base score 8.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.35% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90091)

## Details

Type

Race Condition

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for this race condition.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90091](https://nvd.nist.gov/vuln/detail/CVE-2026-90091)
- [https://git.kernel.org/stable/c/32a7bc6e93be36b37fe61f351d312d358195bd61](https://git.kernel.org/stable/c/32a7bc6e93be36b37fe61f351d312d358195bd61)
- [https://git.kernel.org/stable/c/4f8c63fe0097c9f6ea34409f82f79b3894903d91](https://git.kernel.org/stable/c/4f8c63fe0097c9f6ea34409f82f79b3894903d91)
- [https://git.kernel.org/stable/c/61d5ddbd524c715b224cbe7e9f01da4e05098b19](https://git.kernel.org/stable/c/61d5ddbd524c715b224cbe7e9f01da4e05098b19)
- [https://git.kernel.org/stable/c/66d6ef18548ae6d7dd452b84115fc82c0a73a4ea](https://git.kernel.org/stable/c/66d6ef18548ae6d7dd452b84115fc82c0a73a4ea)
- [https://git.kernel.org/stable/c/7c7ac736b50fa259ed1bdddc18d79523f07c0442](https://git.kernel.org/stable/c/7c7ac736b50fa259ed1bdddc18d79523f07c0442)
- [https://git.kernel.org/stable/c/827de6bd2865b22aaabd554540def3b8a33018ab](https://git.kernel.org/stable/c/827de6bd2865b22aaabd554540def3b8a33018ab)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)