CVE-2026-68393: Bluetooth: hci_sync: extend conn_hash lookup critical sections
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hcisync: extend connhash 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 hciconnhash lookup and use of the returned conn.
Add surrounding rcureadlock() also when return value is not used, in preparation for RCU lockdep requirement to hcilookupleconnect().
This avoids concurrent deletion of the conn before we are done dereferencing it.
Also, make sure to hold hdev->lock when accessing hdev->acceptlist.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68393?
CVE-2026-68393 has a risk rating of 47, indicating a critical vulnerability.
How do I fix CVE-2026-68393?
To address CVE-2026-68393, ensure that you are using a patched version of the Linux kernel that resolves this Bluetooth connection issue.
What systems are affected by CVE-2026-68393?
CVE-2026-68393 affects the Linux kernel, specifically Bluetooth functionality.
What are the potential consequences of CVE-2026-68393?
Exploiting CVE-2026-68393 may lead to use-after-free errors which could compromise system stability and security.
When was CVE-2026-68393 published?
CVE-2026-68393 was published on August 10, 2026.