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CVE-2026-68393: Bluetooth: hci_sync: extend conn_hash lookup critical sections

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-21
• Weakness: CWE-416

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.

Affected products

• Linux kernel: from 6.12.28 before 6.12.114; from 6.14.6 before 6.15; 6.15 — fixed in 6.12.114, 6.15, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.114, 6.15, 7.2. Check the vendor advisory for mitigations.

References

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

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