Bug 2517039 (CVE-2026-74541)

Summary:	CVE-2026-74541 kernel: Bluetooth: ISO: clear iso_data always when detaching conn from hcon
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
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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Doc Text:	A flaw was found in the Linux kernel's Bluetooth ISO subsystem. This vulnerability arises from the system's failure to properly clear `iso_data` when a connection is detached from its host controller connection (`hcon`). A local attacker could exploit this use-after-free condition to cause a denial of service or potentially achieve arbitrary code execution.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 12:46:13 UTC

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

Bluetooth: ISO: clear iso_data always when detaching conn from hcon

When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is
necessary, otherwise later iso_conn_free() will UAF.

Fix clearing of iso_data in iso_sock_disconn()

Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on
iso_sock_release() followed by hci_abort_conn_sync().

Comment 1 Mauro Matteo Cascella 2026-08-19 19:05:57 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081548-CVE-2026-74541-99b5@gregkh/T