Bug 2404116 (CVE-2025-39973)

Summary: CVE-2025-39973 kernel: i40e: add validation for ring_len param
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was identified in the Intel “i40e” Ethernet driver in the Linux Kernel where the ring_len parameter supplied by a VF (virtual function) is passed unchecked to the hardware memory context. If a malicious Virtual function provides a too-large or misaligned ring_len, it may allow the device to configure excessive Tx/Rx queue length leading to memory corruption or other undefined behaviour in the driver context.
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Description OSIDB Bzimport 2025-10-15 08:02:53 UTC 
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.
Comment 1 Alexander B 2025-10-16 10:28:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025101557-CVE-2025-39973-b1a3@gregkh/T