CVE-2025-39973
In the Linux kernel, the following vulnerability has been resolved: i40e: add validation for ring_len param The `ring_len` parameter provided by the virtual function (VF) is assigned directly to the hardware memory context (HMC) without any validation. To address this, introduce an upper boundary check for both Tx and Rx queue lengths. The maximum number of descriptors supported by the hardware is 8k-32. Additionally, enforce alignment constraints: Tx rings must be a multiple of 8, and Rx rings must be a multiple of 32.
Affected versions
Linux kernel versions
3.12
and later are affected. Fixed in
5.4.300,
5.10.245,
5.15.194,
6.1.155,
6.6.109,
6.12.50,
6.16.10,
6.17
and their respective stable series.
References
The following references provide additional information about CVE-2025-39973 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0543d40d6513cdf1c7882811086e59a6455dfe97
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PatchKernel patch commithttps://git.kernel.org/stable/c/05fe81fb9db20464fa532a3835dc8300d68a2f84
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PatchKernel patch commithttps://git.kernel.org/stable/c/45a7527cd7da4cdcf3b06b5c0cb1cae30b5a5985
Frequently asked questions
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What is CVE-2025-39973?
CVE-2025-39973 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.12 onward and has been patched in 5.4.300, 5.10.245, 5.15.194 and others. CVE-2025-39973 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-39973?
Yes — CVE-2025-39973 has been patched. Fixed versions include 5.4.300, 5.10.245, 5.15.194 and others. If you are running Linux kernel 3.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-39973 actively exploited?
No — CVE-2025-39973 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.