Bug 2517078 (CVE-2026-74538)

Summary:	CVE-2026-74538 kernel: Bluetooth: ISO: lock sk in iso_connect_ind
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 (Isochronous Stream) subsystem. A missing lock when accessing socket connection information within the `iso_connect_ind` function could lead to a null pointer dereference. This vulnerability could allow a local attacker to cause a system crash, resulting in a Denial of Service (DoS).	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 12:48:33 UTC

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

Bluetooth: ISO: lock sk in iso_connect_ind

Accessing iso_pi(sk)->conn requires lock_sock, which is not taken in the
"ev3" part of iso_connect_ind.  It may also be NULL if socket has
transitioned away from the LISTEN/CONNECT states before locking.

Fix by adding lock/release. Recheck hcon is valid after lock acquire
where needed.

Comment 1 TEJ RATHI 2026-08-17 13:04:41 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081548-CVE-2026-74538-85c1@gregkh/T