Bug 2559839 (CVE-2026-99045)

Summary:	CVE-2026-99045 kernel: ibmveth: h_free logical LAN on open-fail after register
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 Linux kernel's IBM Virtual Ethernet (ibmveth) driver. This issue can lead to a denial of service (DoS) or system instability due to improper resource cleanup during device activation. When memory allocation fails after registering a logical network with the underlying hypervisor, the driver unmaps memory buffers without deregistering the interface, leaving stale memory references in the hypervisor. A local user with administrative privileges could trigger this condition when attempting to bring up the network interface under low-memory conditions.	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 2026-10-23 13:52:22 UTC

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

ibmveth: h_free logical LAN on open-fail after register

ibmveth_open() registers the logical LAN, then allocates the RX
buffer pools. A pool failure jumps to out_free_buffer_pools without
h_free_logical_lan(), so PHYP still owns the buffer-list page when
it is unmapped. request_irq() failure already issued the hypercall
before taking the same label.

Move that h_free to the shared post-register unwind so both paths
deregister before the buffer list is unmapped.