Bug 2502462 (CVE-2026-63974)

Summary:	CVE-2026-63974 kernel: Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Bluetooth hci_sync component of the Linux kernel. 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.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-19 16:09:28 UTC

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.

Comment 1 Mauro Matteo Cascella 2026-07-21 11:23:04 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071900-CVE-2026-63974-2863@gregkh/T