Bug 2541311 (CVE-2026-98051)

Summary:	CVE-2026-98051 kernel: net: bcmasp: fix tx_spb_ring_full() checking same slot cnt times
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 Broadcom ASP 2.0 Ethernet driver. When evaluating whether sufficient transmit buffer space is available for outgoing packets, the driver fails to properly verify all required consecutive descriptor slots. A local user could exploit this flaw by generating network traffic under heavy queue load, causing the driver to transmit data into already occupied slots. This issue can lead to buffer corruption, driver failure, and 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 2026-09-25 11:18:09 UTC

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

net: bcmasp: fix tx_spb_ring_full() checking same slot cnt times

The loop initialised next_index from intf->tx_spb_index on every
iteration, so incr_ring() always produced the same result and only
one slot was ever tested.  Move the initialisation before the loop
so each iteration advances next_index and the function correctly
checks that cnt consecutive descriptor slots are available before
allowing a new transmission.

Comment 1 Keith Grant 2026-09-28 23:36:12 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98051.mbox