Bug 2348905 (CVE-2025-21802)

Summary: CVE-2025-21802 kernel: net: hns3: fix oops when unload drivers paralleling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-27 21:02:42 UTC 
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.
Comment 1 Avinash Hanwate 2025-02-28 07:24:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022752-CVE-2025-21802-0cc5@gregkh/T