Bluetooth: hci_sync: extend conn_hash lookup critical sections (CVE-2026-68393) | HOL Guard CVE

High · CVSS 8.8CVE-2026-68393

Bluetooth: hci_sync: extend conn_hash lookup critical sections

Answer in brief

CVE-2026-68393 records a High severity (CVSS 8.8) vulnerability in Bluetooth: hci_sync: extend conn_hash lookup critical sections. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 10, 2026Updated Aug 17, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=6d0417e4e1cf66fd917f06f0454958362714ef7d <83b7e67698d0b93f685875ce82c8d335436834f7 \|\| >=6d0417e4e1cf66fd917f06f0454958362714ef7d <38326774df6198df0cc2744cc73bf77cb741c538 \|\| >=6d0417e4e1cf66fd917f06f0454958362714ef7d <d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d \|\| eb8b860e87b296bd1874c79a668081efd00f9754 \|\| 94bf6380e936339a700c0b3171a49baf512aa70b \|\| >=6.12.28 <6.13 \|\| >=6.14.6 <6.15	83b7e67698d0b93f685875ce82c8d335436834f7, 38326774df6198df0cc2744cc73bf77cb741c538, d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d, 6.13, 6.15
Linux/Linuxgeneric	6.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 83b7e67698d0b93f685875ce82c8d335436834f7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.