What’s Vulnerable › Vulnerabilities

CVE-2026-63974: Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-30
• Weakness: CWE-400

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.

Affected products

• Linux: from 5.18.18 before 5.19; from 5.19.2 before 5.20 — fixed in 5.19, 5.20

How to fix

Upgrade to a fixed version: Linux 5.19, 5.20. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/47330cc875b36a1cf7b3543cb2cf90a7c603ce0e
• https://git.kernel.org/stable/c/525daaea459fc215f432de1b8debbd9144bf97b0
• https://git.kernel.org/stable/c/60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff
• https://git.kernel.org/stable/c/7b81c1378b79c3143ca3fdb3d18ac0f01cbabb21
• https://git.kernel.org/stable/c/9cebe4680bb9a72f80c6541eb24af06db7a1fbc9
• https://git.kernel.org/stable/c/ccf07dfb9d7d1e2c7a1eeb782f90d9b614ebba9c

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