Bug 2464433 (CVE-2026-43022)

Summary:	CVE-2026-43022 kernel: Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Bluetooth Host Controller Interface (HCI) synchronization component of the Linux kernel. The `hci_cmd_sync_queue_once()` function did not properly signal when a command was already queued, which could lead to resource leaks. An attacker could potentially exploit this to cause a Denial of Service by exhausting system resources.	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 2026-05-01 15:06:34 UTC

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

hci_cmd_sync_queue_once() needs to indicate whether a queue item was
added, so caller can know if callbacks are called, so it can avoid
leaking resources.

Change the function to return -EEXIST if queue item already exists.

Modify all callsites to handle that.

Comment 1 Keith Grant 2026-05-01 16:57:59 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050158-CVE-2026-43022-00f0@gregkh/T