CVE-2025-21802: net: hns3: fix oops when unload drivers paralleling

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-27 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix oops when unload drivers paralleling When unload hclge driver, it tries to disable sriov first for each ae_dev node from hnae3_ae_dev_list. If user unloads hns3 driver at the time, because it removes all the ae_dev nodes, and it may cause oops. But we can't simply use hnae3_common_lock for this. Because in the process flow of pci_disable_sriov(), it will trigger the remove flow of VF, which will also take hnae3_common_lock. To fixes it, introduce a new mutex to protect the unload process.

Affected products

Linux kernel: from 4.19.214 before 4.20; from 5.4.156 before 5.5; from 5.10.76 before 5.10.235; from 5.14.15 before 5.15; from 5.15.1 before 5.15.179; from 5.16 before 6.1.129 — fixed in 4.20, 5.10.235, 5.15, 5.15.179, 5.5, 6.1.129

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.235, 5.15, 5.15.179. Check the vendor advisory for mitigations.

References

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