High [CVE-2026-63974] Set HCI_CMD_DRAIN_WORKQUEUE during device close
This high-severity Red Hat Linux advisory covers CVE-2026-63974 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Shadow Migration Toolkit for Virtualization for RHEL 10.
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VulniPulse record published Record updated
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Summary
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.
When the hci_dev_close_sync() function is called during a device reset, the system may experience queuing timeouts. This occurs because the HCI_CMD_DRAIN_WORKQUEUE flag is not properly set, which can lead to system instability or a denial of service (DoS) condition.
Red Hat severity: Moderate — CVSS 7.3 (CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H). Weakness: CWE-366.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Shadow Migration Toolkit for Virtualization for RHEL 10. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8 as not affected.
Red Hat fixing advisory: RHSA-2026:83207, RHSA-2026:86033.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- kernel-0:6.12.0-211.66.1.el10_2
- kernel-0:5.14.0-687.59.1.el9_8
- RHSA-2026:83207
- RHSA-2026:86033
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- To mitigate this issue, disable the Bluetooth service if it is not required. To disable the Bluetooth service: `sudo systemctl stop bluetooth` `sudo systemctl disable bluetooth` Alternatively, prevent the `bluetooth` kernel module from loading by creating a file `/etc/modprobe.d/bluetooth.conf` with the content `blacklist bluetooth`. Then, regenerate the initramfs using `sudo dracut -f -v`. A system reboot is required for the module blacklisting to take effect. Disabling Bluetooth may impact functionality that relies on Bluetooth connectivity.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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