CVE-2021-47184: i40e: Fix NULL ptr dereference on VSI filter sync

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-10 · updated 2026-08-04
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix NULL ptr dereference on VSI filter sync Remove the reason of null pointer dereference in sync VSI filters. Added new I40E_VSI_RELEASING flag to signalize deleting and releasing of VSI resources to sync this thread with sync filters subtask. Without this patch it is possible to start update the VSI filter list after VSI is removed, that's causing a kernel oops.

Affected products

Linux kernel: from 3.12 before 4.14.256; from 4.15 before 4.19.218; from 4.20 before 5.4.162; from 5.5 before 5.10.82; from 5.11 before 5.15.5; 5.16-rc1 — fixed in 4.14.256, 4.19.218, 5.10.82, 5.15.5, 5.4.162

How to fix

Upgrade to a fixed version: Linux kernel 4.14.256, 4.19.218, 5.10.82, 5.15.5. Check the vendor advisory for mitigations.

References

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