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CVE-2025-39969: i40e: fix validation of VF state in get resources

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-15 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: i40e: fix validation of VF state in get resources VF state I40E_VF_STATE_ACTIVE is not the only state in which VF is actually active so it should not be used to determine if a VF is allowed to obtain resources. Use I40E_VF_STATE_RESOURCES_LOADED that is set only in i40e_vc_get_vf_resources_msg() and cleared during reset.

Affected products

• Linux kernel: from 5.4.165 before 5.4.300; from 5.10.85 before 5.10.245; from 5.15.8 before 5.15.194; 5.16 — fixed in 5.10.245, 5.15.194, 5.4.300, 6.17

How to fix

Upgrade to a fixed version: Linux kernel 5.10.245, 5.15.194, 5.4.300, 6.17. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/185745d56ec958bf8aa773828213237dfcc32f5a
• https://git.kernel.org/stable/c/6128bbc7adc25c87c2f64b5eb66a280b78ef7ab7
• https://git.kernel.org/stable/c/6c3981fd59ef11a75005ac9978f034da5a168b6a
• https://git.kernel.org/stable/c/877b7e6ffc23766448236e8732254534c518ba42
• https://git.kernel.org/stable/c/8e35c80f8570426fe0f0cc92b151ebd835975f22
• https://git.kernel.org/stable/c/a991dc56d3e9a2c3db87d0c3f03c24f6595400f1
• https://git.kernel.org/stable/c/e748f1ee493f88e38b77363a60499f979d42c58a
• https://git.kernel.org/stable/c/f47876788a23de296c42ef9d505b5c1630f0b4b8

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