Bug 2502472 (CVE-2026-63928)

Summary:	CVE-2026-63928 kernel: USB: serial: omninet: fix memory corruption with small endpoint
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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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's USB serial omninet driver. A malicious Universal Serial Bus (USB) device could exploit this by reporting a smaller maximum packet size than anticipated. This action would cause the system to allocate undersized data buffers, leading to memory corruption. Such corruption could allow an attacker to trigger a denial of service or potentially execute unauthorized code.	Story Points:	---
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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 16:09:58 UTC

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

USB: serial: omninet: fix memory corruption with small endpoint

Make sure that the bulk-out buffers are at least as large as the
hardcoded transfer size to avoid user-controlled slab corruption should
a malicious device report a smaller endpoint max packet size than
expected.

Comment 1 Mauro Matteo Cascella 2026-07-21 10:36:46 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071949-CVE-2026-63928-7715@gregkh/T