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.

Classification

CVE ID: CVE-2025-21802

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 9.23% (scored less or equal to compared to others)

EPSS Date: 2025-03-28 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-21802
https://git.kernel.org/stable/c/e876522659012ef2e73834a0b9f1cbe3f74d5fad
https://git.kernel.org/stable/c/b5a8bc47aa0a4aa8bca5466dfa2d12dbb5b3cd0c
https://git.kernel.org/stable/c/82736bb83fb0221319c85c2e9917d0189cd84e1e
https://git.kernel.org/stable/c/cafe9a27e22736d4a01b3933e36225f9857c7988
https://git.kernel.org/stable/c/92e5995773774a3e70257e9c95ea03518268bea5

Timeline