Bug 2461532 (CVE-2026-31645)

Summary:	CVE-2026-31645 kernel: net: lan966x: fix page pool leak in error paths
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
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 Linux kernel's lan966x network driver. This vulnerability, a page pool leak, occurs when certain error paths in the `lan966x_fdma_rx_alloc()` and `lan966x_fdma_init()` functions fail to properly destroy allocated page pools. This oversight can lead to a gradual depletion of system memory resources, potentially resulting in a Denial of Service (DoS) condition where the system becomes unresponsive or crashes.	Story Points:	---
Clone Of:		Environment:
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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 2026-04-24 15:06:58 UTC

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

net: lan966x: fix page pool leak in error paths

lan966x_fdma_rx_alloc() creates a page pool but does not destroy it if
the subsequent fdma_alloc_coherent() call fails, leaking the pool.

Similarly, lan966x_fdma_init() frees the coherent DMA memory when
lan966x_fdma_tx_alloc() fails but does not destroy the page pool that
was successfully created by lan966x_fdma_rx_alloc(), leaking it.

Add the missing page_pool_destroy() calls in both error paths.

Comment 1 Keith Grant 2026-04-24 21:37:09 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042458-CVE-2026-31645-812d@gregkh/T