Bug 2448694 (CVE-2026-23262)

Summary:	CVE-2026-23262 kernel: gve: Fix stats report corruption on queue count change
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	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A memory corruption vulnerability was found in the Linux kernel's Google Virtual Ethernet (gve) driver. The driver and NIC share a memory region for statistics reporting, with the NIC calculating its write offset based on the region size. When queue count is increased, the driver resizes the stats region, but the NIC continues using the old offset calculation, causing out-of-bounds writes past the allocated buffer and corrupting kernel memory.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-03-18 18:02:51 UTC

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

gve: Fix stats report corruption on queue count change

The driver and the NIC share a region in memory for stats reporting.
The NIC calculates its offset into this region based on the total size
of the stats region and the size of the NIC's stats.

When the number of queues is changed, the driver's stats region is
resized. If the queue count is increased, the NIC can write past
the end of the allocated stats region, causing memory corruption.
If the queue count is decreased, there is a gap between the driver
and NIC stats, leading to incorrect stats reporting.

This change fixes the issue by allocating stats region with maximum
size, and the offset calculation for NIC stats is changed to match
with the calculation of the NIC.

Comment 1 Jon Moroney 2026-03-18 19:37:56 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026031820-CVE-2026-23262-a421@gregkh/T