CVE-2025-40104ixgbevf: fix mailbox API compatibility by negotiating supported features
Updated under an hour ago ()
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0062e7cc955e0827a88570ed36ea511a7dcb391e before 871ac1cd4ce4804defcb428cbb003fd84c415ff4; 0062e7cc955e0827a88570ed36ea511a7dcb391e builds before 2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18; from 0062e7cc955e0827a88570ed36ea511a7dcb391e before bf580112ed61736c2645a893413a04732505d4b1; from 0062e7cc955e0827a88570ed36ea511a7dcb391e before a376e29b1b196dc90b50df7e5e3947e3026300c4; from 0062e7cc955e0827a88570ed36ea511a7dcb391e before a7075f501bd33c93570af759b6f4302ef0175168 | CNA record |
References
- https://git.kernel.org/stable/c/871ac1cd4ce4804defcb428cbb003fd84c415ff4
- https://git.kernel.org/stable/c/2e0aab9ddaf1428602c78f12064cd1e6ffcc4d18
- https://git.kernel.org/stable/c/bf580112ed61736c2645a893413a04732505d4b1
- https://git.kernel.org/stable/c/a376e29b1b196dc90b50df7e5e3947e3026300c4
- https://git.kernel.org/stable/c/a7075f501bd33c93570af759b6f4302ef0175168
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.