CVE-2025-21802: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.19.214 — 4.20
linux	linux_kernel	5.4.156 — 5.5
linux	linux_kernel	5.10.76 — 5.10.235
linux	linux_kernel	5.14.15 — 5.15
linux	linux_kernel	5.15.1 — 5.15.179
linux	linux_kernel	5.16 — 6.1.129
linux	linux_kernel	6.2 — 6.6.76
linux	linux_kernel	6.7 — 6.12.13
linux	linux_kernel	6.13 — 6.13.2
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/622d92a67656e5c4d2d6ccac02d688ed995418c6 https://git.kernel.org/stable/c/82736bb83fb0221319c85c2e9917d0189cd84e1e https://git.kernel.org/stable/c/8c640dd3d900cc8988a39c007591f1deee776df4 https://git.kernel.org/stable/c/92e5995773774a3e70257e9c95ea03518268bea5 https://git.kernel.org/stable/c/b5a8bc47aa0a4aa8bca5466dfa2d12dbb5b3cd0c https://git.kernel.org/stable/c/cafe9a27e22736d4a01b3933e36225f9857c7988 https://git.kernel.org/stable/c/e876522659012ef2e73834a0b9f1cbe3f74d5fad

Other References

https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html

Frequently Asked Questions

What is CVE-2025-21802? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21802? +

CVE-2025-21802 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21802? +

CVE-2025-21802 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21802? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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