Bug 2554916 (CVE-2026-98571)

Summary:	CVE-2026-98571 kernel: net: stmmac: clear stale buf->page after recycling on skb build failure
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 stmmac network driver. This vulnerability can lead to a Denial of Service (DoS) or memory corruption when processing incoming network traffic under resource constraints. When the driver fails to allocate a network packet buffer, it recycles the underlying memory page without clearing its reference pointer. An attacker sending network packets during memory pressure could trigger this condition, causing the driver to reuse the recycled memory page and crash the system.	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 2026-10-18 15:32:15 UTC

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

net: stmmac: clear stale buf->page after recycling on skb build failure

In stmmac_rx(), when napi_build_skb() fails the descriptor page is
recycled back to the page pool with page_pool_recycle_direct(), but
buf->page is left pointing at the recycled page, unlike every other
consumption site in the function which clears the pointer after handing
the page away.

With the stale pointer stmmac_rx_refill() skips the replacement
allocation and programs the already-recycled page back into the RX
descriptor.

Clear buf->page on the napi_build_skb() failure path to keep the buffer
lifecycle consistent with the other consumption sites.