Answer in brief
CVE-2025-40104 records a High severity (CVSS 7.8) vulnerability in ixgbevf: fix mailbox API compatibility by negotiating supported features. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0062e7cc955e0827a88570ed36ea511a7dcb391e <871ac1cd4ce4804defcb428cbb003fd84c415ff4 || >=0062e7cc955e0827a88570ed36ea511a7dcb391e <2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18 || >=0062e7cc955e0827a88570ed36ea511a7dcb391e <bf580112ed61736c2645a893413a04732505d4b1 || >=0062e7cc955e0827a88570ed36ea511a7dcb391e <a376e29b1b196dc90b50df7e5e3947e3026300c4 || >=0062e7cc955e0827a88570ed36ea511a7dcb391e <a7075f501bd33c93570af759b6f4302ef0175168 | 871ac1cd4ce4804defcb428cbb003fd84c415ff4, 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18, bf580112ed61736c2645a893413a04732505d4b1, a376e29b1b196dc90b50df7e5e3947e3026300c4, a7075f501bd33c93570af759b6f4302ef0175168 |
| Linux/Linuxgeneric | 4.20 | Not reported |
Published upstream
Oct 30, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ixgbevf: fix mailbox API compatibility by negotiating supported features There was backward compatibility in the terms of mailbox API. Various drivers from various OSes supporting 10G adapters from Intel portfolio could easily negotiate mailbox API. This convention has been broken since introducing API 1.4. Commit 0062e7cc955e ("ixgbevf: add VF IPsec offload code") added support for IPSec which is specific only for the kernel ixgbe driver. None of the rest of the Intel 10G PF/VF drivers supports it. And actually lack of support was not included in the IPSec implementation - there were no such code paths. No possibility to negotiate support for the feature was introduced along with introduction of the feature itself. Commit 339f28964147 ("ixgbevf: Add support for new mailbox communication between PF and VF") increasing API version to 1.5 did the same - it introduced code supported specifically by the PF ESX driver. It altered API version for the VF driver in the same time not touching the version defined for the PF ixgbe driver. It led to additional discrepancies, as the code provided within API 1.6 cannot be supported for Linux ixgbe driver as it causes crashes. The issue was noticed some time ago and mitigated by Jake within the commit d0725312adf5 ("ixgbevf: stop attempting IPSEC offload on Mailbox API 1.5"). As a result we have regression for IPsec support and after increasing API to version 1.6 ixgbevf driver stopped to support ESX MBX. To fix this mess add new mailbox op asking PF driver about supported features. Basing on a response determine whether to set support for IPSec and ESX-specific enhanced mailbox. New mailbox op, for compatibility purposes, must be added within new API revision, as API version of OOT PF & VF drivers is already increased to 1.6 and doesn't incorporate features negotiate op. Features negotiation mechanism gives possibility to be extended with new features when needed in the future.
Quoted source text, attributed separately from HOL analysis.