Bug 2422839 (CVE-2025-68302)

Summary:	CVE-2025-68302 kernel: Linux kernel sxgbe driver: Denial of Service due to null pointer dereference
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:	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 sxgbe network driver. This vulnerability occurs in the `sxgbe_rx()` function when a socket buffer (skb) is unexpectedly null. This condition can lead to a null pointer dereference, which could cause the system to crash. This results in a Denial of Service (DoS) for affected systems.	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 2025-12-16 16:05:34 UTC

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

net: sxgbe: fix potential NULL dereference in sxgbe_rx()

Currently, when skb is null, the driver prints an error and then
dereferences skb on the next line.

To fix this, let's add a 'break' after the error message to switch
to sxgbe_rx_refill(), which is similar to the approach taken by the
other drivers in this particular case, e.g. calxeda with xgmac_rx().

Found during a code review.

Comment 1 Alexander B 2025-12-16 17:16:15 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121643-CVE-2025-68302-913d@gregkh/T