CVE-2025-21715: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net: davicom: fix UAF in dm9000_drv_remove dm is netdev private data and it cannot be used after free_netdev() call. Using dm after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function. This is similar to the issue fixed in commit ad297cd2db89 ("net: qcom/emac: fix UAF in emac_remove"). This bug is detected by our static analysis tool.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.4.262 — 4.5
linux	linux_kernel	4.9.262 — 4.10
linux	linux_kernel	4.14.226 — 4.15
linux	linux_kernel	4.19.181 — 4.20
linux	linux_kernel	5.4.106 — 5.4.291
linux	linux_kernel	5.10.24 — 5.10.235
linux	linux_kernel	5.11.7 — 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

References

Advisories & Patches

https://git.kernel.org/stable/c/19e65c45a1507a1a2926649d2db3583ed9d55fd9 https://git.kernel.org/stable/c/2013c95df6752d9c88221d0f0f37b6f197969390 https://git.kernel.org/stable/c/5a54367a7c2378c65aaa4d3cfd952f26adef7aa7 https://git.kernel.org/stable/c/7d7d201eb3b766abe590ac0dda7a508b7db3e357 https://git.kernel.org/stable/c/a53cb72043443ac787ec0b5fa17bb3f8ff3d462b https://git.kernel.org/stable/c/c411f9a5fdc9158e8f7c57eac961d3df3eb4d8ca https://git.kernel.org/stable/c/c94ab07edc2843e2f3d46dbd82e5c681503aaadf https://git.kernel.org/stable/c/db79e982c5f9e39ab710cbce55b05f2f5e6f1ca9

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-2025-21715? +

In the Linux kernel, the following vulnerability has been resolved: net: davicom: fix UAF in dm9000_drv_remove dm is netdev private data and it cannot be used after free_netdev() call. Using dm after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function. This is similar to the issue fixed in commit ad297cd2db89 ("net: qcom/emac: fix UAF in emac_remove"). This bug is detected by our static analysis tool. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21715? +

CVE-2025-21715 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-21715? +

CVE-2025-21715 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-2025-21715? +

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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