Bug 2388918 (CVE-2025-38526)

Summary: CVE-2025-38526 kernel: ice: add NULL check in eswitch lag check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the ice module in the Linux kernel. An improper check can cause a NULL pointer dereference when the ice_lag_is_switchdev_running function is called from outside of the LAG event handler code, resulting in a denial of service.
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Description OSIDB Bzimport 2025-08-16 12:01:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ice: add NULL check in eswitch lag check

The function ice_lag_is_switchdev_running() is being called from outside of
the LAG event handler code.  This results in the lag->upper_netdev being
NULL sometimes.  To avoid a NULL-pointer dereference, there needs to be a
check before it is dereferenced.
Comment 1 Alexander B 2025-08-18 11:45:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081653-CVE-2025-38526-f115@gregkh/T