Bug 2397577 (CVE-2025-39875)

Summary: CVE-2025-39875 kernel: igb: Fix NULL pointer dereference in ethtool loopback test
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-23 07:02:50 UTC 
In the Linux kernel, the following vulnerability has been resolved:

igb: Fix NULL pointer dereference in ethtool loopback test

The igb driver currently causes a NULL pointer dereference when executing
the ethtool loopback test. This occurs because there is no associated
q_vector for the test ring when it is set up, as interrupts are typically
not added to the test rings.

Since commit 5ef44b3cb43b removed the napi_id assignment in
__xdp_rxq_info_reg(), there is no longer a need to pass a napi_id to it.
Therefore, simply use 0 as the last parameter.
Comment 1 Jon Moroney 2025-09-23 16:59:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025092300-CVE-2025-39875-6d27@gregkh/T