Bug 2521414 (CVE-2026-74642)

Summary:	CVE-2026-74642 kernel: ALSA: usb: Fix UAF at delayed release of MIDI2 EPs
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
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the ALSA USB MIDI2 EPs component of the Linux kernel. This use-after-free (UAF) vulnerability occurs due to a delayed release of MIDI2 endpoints, leading to an attempt to dereference an already freed Universal MIDI Packet (UMP) endpoint object. An attacker could potentially exploit this memory corruption to achieve arbitrary code execution or cause a denial of service.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-22 15:44:25 UTC

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

ALSA: usb: Fix UAF at delayed release of MIDI2 EPs

The recent fix for UAF in ump_to_endpoint() caused another UAF because
it tries to dereference the UMP endpoint object, but this might be
executed at a delayed context where the endpoint has been already
released.

Add private_free to clear the associated data for avoiding the further
dereference for delayed releases.

Comment 1 Mauro Matteo Cascella 2026-08-24 12:45:33 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082223-CVE-2026-74642-68fd@gregkh/T