Review reviewHigh

CVE-2026-63974

Linux

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.

CVSS: 8.8
EPSS: -
CISA KEV: Not listed
Published: 2026.07.20

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9, >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e, >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff, >= 877afadad2dce8aae1f2aad8ce47e072d4f6165e < 525daaea459fc215f432de1b8debbd9144bf97b0, >= 4bf367fa1fefabdf14938d0ac9ed60020389112e, >= 3b382555706558f5c0587862b6dc03e96a252bba, >= 5.18.18 < 5.19, >= 5.19.2 < 5.20, >= 6.0
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: Not available