Security readout for executives and security teams
Plain-English summary
A Linux i40e network-driver flaw can let a low-privileged local actor request virtual-function resources during an invalid state. The supplied CVSS assessment indicates possible compromise of confidentiality, integrity, and availability across a security boundary. Exposure depends on systems using i40e with SR-IOV virtual functions, so ordinary Linux installations may not be reachable.
Executive priority
Treat as a high-priority infrastructure issue where i40e SR-IOV VFs cross workload or tenant trust boundaries. First establish whether that configuration exists; then patch affected hosts through supported kernel channels. Lower the immediate priority for systems without i40e, without configured VFs, or without plausible low-privileged local access, while retaining normal update coverage.
Technical view
The i40e driver incorrectly treated I40E_VF_STATE_ACTIVE as sufficient authorization for a VF resource request. That state does not reliably mean resources are loaded. The correction checks I40E_VF_STATE_RESOURCES_LOADED, which is set during resource allocation and cleared on reset. CVSS 3.1 is 8.8: local access, low complexity, low privileges, no user interaction, and changed scope.
Likely exposure
Most relevant to Linux hosts using the i40e driver with SR-IOV virtual functions, especially where less-trusted local users or workloads can interact with VFs. The source bundle marks several kernel releases affected, but its version lists are complex and potentially distribution-dependent. Confirm exposure using the running kernel package, driver configuration, and vendor backport information.
Exploitation context
The supplied record is not in KEV and provides no evidence of active or public exploitation. The CVSS vector describes a local, low-privilege attack rather than remote network exploitation. Successful abuse also appears dependent on reaching the affected i40e VF resource-management path in an inappropriate state; the bundle does not document a proven exploit or observed incidents.
Researcher notes
The defect is a state-validation error in the VF resource path, corrected by testing RESOURCES_LOADED instead of ACTIVE. The supplied version data includes commit identifiers and release numbers with differing default-status declarations, so simplistic version-string matching is unreliable. Use distribution backport records or inspect source provenance. No CWE, exploit proof, incident evidence, or workaround is supplied.
Mitigation direction
- Install a vendor-supported kernel update containing the applicable stable i40e correction.
- Consult distribution advisories for corrected package versions and backport status.
- Prioritize multi-tenant or less-trusted hosts that expose i40e SR-IOV virtual functions.
- Follow vendor guidance if immediate kernel replacement is operationally constrained.
Validation and detection
- Inventory running kernel versions and identify systems loading the i40e driver.
- Determine whether SR-IOV virtual functions are configured on affected network adapters.
- Confirm the installed kernel includes the relevant stable fix or vendor backport.
- After updating and rebooting, verify the active kernel package and i40e driver state.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2025-39969 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H26LinuxVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/185745d56ec958bf8aa773828213237dfcc32f5aCVE reference, Linux
- https://git.kernel.org/stable/c/f47876788a23de296c42ef9d505b5c1630f0b4b8CVE reference, Linux
- https://git.kernel.org/stable/c/8e35c80f8570426fe0f0cc92b151ebd835975f22CVE reference, Linux
- https://git.kernel.org/stable/c/6c3981fd59ef11a75005ac9978f034da5a168b6aCVE reference, Linux
- https://git.kernel.org/stable/c/e748f1ee493f88e38b77363a60499f979d42c58aCVE reference, Linux
- https://git.kernel.org/stable/c/6128bbc7adc25c87c2f64b5eb66a280b78ef7ab7CVE reference, Linux
- https://git.kernel.org/stable/c/a991dc56d3e9a2c3db87d0c3f03c24f6595400f1CVE reference, Linux
- https://git.kernel.org/stable/c/877b7e6ffc23766448236e8732254534c518ba42CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.