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CVE-2025-21969

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd After the hci sync command releases l2cap_conn, the hci receiv…

Published Apr 1, 2025CWE-416EPSS 0.23%

Overview

CVE-2025-21969 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd

After the hci sync command releases l2cap_conn, the hci receive data work

queue references the released l2cap_conn when sending to the upper layer.

Add hci dev lock to the hci receive data work queue to synchronize the two.

[1]

BUG: KASAN: slab-use-after-free in l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954

Read of size 8 at addr ffff8880271a4000 by task kworker/u9:2/5837

CPU: 0 UID: 0 PID: 5837 Comm: kworker/u9:2 Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024

Workqueue: hci1 hci_rx_work

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120

print_address_description mm/kasan/report.c:378 [inline]

print_report+0x169/0x550 mm/kasan/report.c:489

kasan_report+0x143/0x180 mm/kasan/report

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/7790a79c6fce8d5d552bc64f5c82819f719e4f28Refgit.kernel.org/stable/c/b4f82f9ed43aefa79bec2504ae8c29be0c0f5d1dRefgit.kernel.org/stable/c/c96cce853542b3b13da3738f35ef1be8cfcc9d1dRefgit.kernel.org/stable/c/f8094625a591eeb0b75b1bd9e713fac1d93f5ca9

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21969?

CVE-2025-21969 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-21969?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21969?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21969?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21969 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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