Bluetooth: hci_sync: extend conn_hash lookup critical sections
CVE-2026-68393 · published 10 Aug 2026
How serious is it
- Severity: high, CVSS score 8.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-68393?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: eb8b860e87b296bd1874c79a668081efd00f9754 to < 3f98e7f38e1bb761a9964a8851f9c08e9c23b3dd, 6d0417e4e1cf66fd917f06f0454958362714ef7d to < 83b7e67698d0b93f685875ce82c8d335436834f7, 6d0417e4e1cf66fd917f06f0454958362714ef7d to < 38326774df6198df0cc2744cc73bf77cb741c538, 6d0417e4e1cf66fd917f06f0454958362714ef7d to < d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d
- Linux Linux: 6.15
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/3f98e7f38e1bb761a9964a8851f9c08e9c23b3dd
- git.kernel.org/stable/c/83b7e67698d0b93f685875ce82c8d335436834f7
- git.kernel.org/stable/c/38326774df6198df0cc2744cc73bf77cb741c538
- git.kernel.org/stable/c/d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON