CVE-2025-39875
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-23

Last updated on: 2025-12-11

Assigner: kernel.org

Description
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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-09-23
Last Modified
2025-12-11
Generated
2026-06-16
AI Q&A
2025-09-23
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39875
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.14 (inc) to 6.16.8 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a NULL pointer dereference in the Linux kernel's igb driver that occurs during the ethtool loopback test. It happens because the test ring does not have an associated q_vector, as interrupts are usually not added to test rings. A recent code change removed the need to pass a napi_id, so the fix uses 0 as the last parameter to prevent the NULL pointer dereference.

Impact Analysis

The vulnerability can cause the Linux kernel to crash or behave unexpectedly when running the ethtool loopback test on the igb driver, due to a NULL pointer dereference. This may lead to system instability or denial of service during network diagnostics or testing.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-39875. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart