EUVD-2026-66571
GHSA-6j22-8cx7-cjfj
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network vector retained as possible if traffic triggers the path, but AC:H reflects the required non-MSI-X hardware configuration; no confidentiality or integrity impact.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
net: ngbe: fix NULL pointer dereference in non-MSI-X interrupt enabling
In non-MSI-X mode (such as legacy INTx or single MSI), wx->msix_entry is not allocated or initialized. Calling NGBE_INTR_MISC(wx) dereferences wx->msix_entry->entry, leading to a NULL pointer dereference crash.
This issue was introduced by fixing the IRQ vector when the number of VFs is 7. Fix the issue by explicitly checking pdev->msix_enabled to determine the correct vector index.
Additionally, as a side fix, set the interrupt mask to BIT(0) for the non-MSI-X fallback. In MSI/INTx mode, the MISC and queue interrupts share vector 0, and the WX_PX_MISC_IVAR register is only valid in the MSI-X case. Thus, BIT(0) is the correct mask for the miscellaneous cause when MSI-X is disabled.
AnalysisAI
NULL pointer dereference in the Linux kernel ngbe (Wangxun) network driver crashes the kernel when the NIC operates in non-MSI-X interrupt mode (legacy INTx or single MSI). Systems running affected kernel versions with Wangxun WX1860-series NICs configured in non-MSI-X mode are exposed to a kernel panic, resulting in complete system availability loss. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the target system must be equipped with a Wangxun WX1860-series network adapter using the ngbe kernel driver, AND (2) the NIC must be operating in non-MSI-X interrupt mode (legacy INTx or single MSI) - this is a non-default configuration on most modern x86 systems where MSI-X is typically negotiated automatically. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS vector (AV:N/AC:L/PR:N/UI:N) warrants scrutiny: if network-received packets trigger the interrupt handling code path that invokes NGBE_INTR_MISC, a remote unauthenticated attacker sending crafted traffic could induce the kernel panic, justifying AV:N/PR:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with the ability to generate network traffic destined for a host running an unpatched kernel with a Wangxun ngbe NIC in non-MSI-X mode sends packets that drive the interrupt handling code path invoking NGBE_INTR_MISC; the macro dereferences the uninitialized wx->msix_entry pointer, triggering a kernel NULL pointer dereference oops and crashing the system. No public exploit or proof-of-concept code has been identified at time of analysis. |
| Remediation | Apply the appropriate stable kernel patch: upgrade to 6.18.46, 7.1.10, or 7.2 (or later), or cherry-pick the fix commits from kernel.org stable (cef4c5b9aca2, 0ab482b2195e, 5f3a13e0bb5e). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Linux systems running Wangxun WX1860-series NICs in non-MSI-X interrupt mode (INTx or single MSI) and assess production impact. …
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External POC / Exploit Code
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