CVE-2026-63974
Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close
Description
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.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 30, 2026, 2:51 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to include the fix.
- Verify HCI_CMD_DRAIN_WORKQUEUE is set during device close.
- Monitor for queuing timeouts after the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63974.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63974 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63974
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63974 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63974 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '877afadad2dce8aae1f2aad8ce47e072d4f6165e', 'lessThan': '9cebe4680bb9a72f80c6541eb24af06db7a1fbc9', 'versionType': 'git'}, {'status': 'affected', 'version': '877afadad2dce8aae1f2aad8ce47e072d4f6165e', 'lessThan': '47330cc875b36a1cf7b3543cb2cf90a7c603ce0e', 'versionType': 'git'}, {'status': 'affected', 'version': '877afadad2dce8aae1f2aad8ce47e072d4f6165e', 'lessThan': '60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff', 'versionType': 'git'}, {'status': 'affected', 'version': '877afadad2dce8aae1f2aad8ce47e072d4f6165e', 'lessThan': '525daaea459fc215f432de1b8debbd9144bf97b0', 'versionType': 'git'}, {'status': 'affected', 'version': '4bf367fa1fefabdf14938d0ac9ed60020389112e', 'versionType': 'git'}, {'status': 'affected', 'version': '3b382555706558f5c0587862b6dc03e96a252bba', 'versionType': 'git'}, {'status': 'affected', 'version': '5.18.18', 'lessThan': '5.19', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.19.2', 'lessThan': '5.20', 'versionType': 'semver'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/47330cc875b36a1cf7b3543cb2cf90a7c603ce0e Added Reference https://git.kernel.org/stable/c/525daaea459fc215f432de1b8debbd9144bf97b0 Added Reference https://git.kernel.org/stable/c/60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff Added Reference https://git.kernel.org/stable/c/9cebe4680bb9a72f80c6541eb24af06db7a1fbc9