Answer in brief
CVE-2026-63974 records a High severity (CVSS 8.8) vulnerability in Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), 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.
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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <9cebe4680bb9a72f80c6541eb24af06db7a1fbc9 || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <47330cc875b36a1cf7b3543cb2cf90a7c603ce0e || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <525daaea459fc215f432de1b8debbd9144bf97b0 || 4bf367fa1fefabdf14938d0ac9ed60020389112e || 3b382555706558f5c0587862b6dc03e96a252bba || >=5.18.18 <5.19 || >=5.19.2 <5.20 | 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9, 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e, 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff, 525daaea459fc215f432de1b8debbd9144bf97b0, 5.19, 5.20 |
| Linux/Linuxgeneric | 6.0 | Not reported |
| Linux/Linuxgeneric | >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21 || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <9cebe4680bb9a72f80c6541eb24af06db7a1fbc9 || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <47330cc875b36a1cf7b3543cb2cf90a7c603ce0e || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <525daaea459fc215f432de1b8debbd9144bf97b0 || 4bf367fa1fefabdf14938d0ac9ed60020389112e || 3b382555706558f5c0587862b6dc03e96a252bba || >=5.18.18 <5.19 || >=5.19.2 <5.20 | 7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21, 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9, 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e, 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff, 525daaea459fc215f432de1b8debbd9144bf97b0, 5.19, 5.20 |
| Linux/Linuxgeneric | >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <ccf07dfb9d7d1e2c7a1eeb782f90d9b614ebba9c || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21 || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <9cebe4680bb9a72f80c6541eb24af06db7a1fbc9 || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <47330cc875b36a1cf7b3543cb2cf90a7c603ce0e || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff || >=877afadad2dce8aae1f2aad8ce47e072d4f6165e <525daaea459fc215f432de1b8debbd9144bf97b0 || 4bf367fa1fefabdf14938d0ac9ed60020389112e || 3b382555706558f5c0587862b6dc03e96a252bba || >=5.18.18 <5.19 || >=5.19.2 <5.20 | ccf07dfb9d7d1e2c7a1eeb782f90d9b614ebba9c, 7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21, 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9, 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e, 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff, 525daaea459fc215f432de1b8debbd9144bf97b0, 5.19, 5.20 |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close Since hci_dev_close_sync() can now be called during the reset path, we should also set HCI_CMD_DRAIN_WORKQUEUE. This avoids queuing timeouts while the hdev workqueue is being drained.
Quoted source text, attributed separately from HOL analysis.