Linux Kernel up to 6.16.7/6.17-rc5 Igb Driver __xdp_rxq_info_reg null pointer dereference

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.16.7/6.17-rc5. Affected is the function __xdp_rxq_info_reg of the component Igb Driver. Performing a manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2025-39875. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.16.7/6.17-rc5. It has been classified as critical. This affects the function __xdp_rxq_info_reg of the component Igb Driver. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2025-39875 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 265867 (Linux Distros Unpatched Vulnerability : CVE-2025-39875), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.16.8 or 6.17-rc6 eliminates this vulnerability. Applying the patch 473be7d39efd3be383e9c0c8e44b53508b4ffeb5/75871a525a596ff4d16c4aebc0018f8d0923c9b1 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265867) and CERT Bund (WID-SEC-2025-2107). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Google Container-Optimized OS
• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• Open Source Linux Kernel
• RESF Rocky Linux
• Dell Secure Connect Gateway
• IBM QRadar SIEM
• Dell NetWorker

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.16.0
• 6.16.1
• 6.16.2
• 6.16.3
• 6.16.4
• 6.16.5
• 6.16.6
• 6.16.7
• 6.17-rc1
• 6.17-rc2
• 6.17-rc3
• 6.17-rc4
• 6.17-rc5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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