CVE-2026-43022 Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

What is CVE-2026-43022?

CVE-2026-43022 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

hci_cmd_sync_queue_once() needs to indicate whether a queue item was added, so caller can know if callbacks are called, so it can avoid leaking resources.

Change the function to return -EEXIST if queue item already exists.

Modify all callsites to handle that.

Which versions are affected by CVE-2026-43022?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43022?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-43022 being exploited?

There is no known exploitation of CVE-2026-43022 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-85374, BELL-CVE-2026-43022, DEBIAN-CVE-2026-43022, GHSA-qgvr-5r26-m585, ROOT-OS-DEBIAN-11-CVE-2026-43022, ROOT-OS-DEBIAN-12-CVE-2026-43022 and 4 more.