CVE-2025-21934: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: rapidio: fix an API misues when rio_add_net() fails rio_add_net() calls device_register() and fails when device_register() fails. Thus, put_device() should be used rather than kfree(). Add "mport->net = NULL;" to avoid a use after free issue.

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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	4.6 — 5.4.291
linux	linux_kernel	5.5 — 5.10.235
linux	linux_kernel	5.11 — 5.15.179
linux	linux_kernel	5.16 — 6.1.131
linux	linux_kernel	6.2 — 6.6.83
linux	linux_kernel	6.7 — 6.12.19
linux	linux_kernel	6.13 — 6.13.7
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/22e4977141dfc6d109bf29b495bf2187b4250990 https://git.kernel.org/stable/c/2537f01d57f08c527e40bbb5862aa6ff43344898 https://git.kernel.org/stable/c/88ddad53e4cfb6de861c6d4fb7b25427f46baed5 https://git.kernel.org/stable/c/a5f5e520e8fbc6294020ff8afa36f684d92c6e6a https://git.kernel.org/stable/c/b2ef51c74b0171fde7eb69b6152d3d2f743ef269 https://git.kernel.org/stable/c/cdd9f58f7fe41a55fae4305ea51fc234769fd466 https://git.kernel.org/stable/c/d4ec862ce80f64db923a1d942b5d11cf6fc87d36 https://git.kernel.org/stable/c/f0aa4ee1cbbf7789907e5a3f6810de01c146c211

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Frequently Asked Questions

What is CVE-2025-21934? +

In the Linux kernel, the following vulnerability has been resolved: rapidio: fix an API misues when rio_add_net() fails rio_add_net() calls device_register() and fails when device_register() fails. Thus, put_device() should be used rather than kfree(). Add "mport->net = NULL;" to avoid a use after free issue. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21934? +

CVE-2025-21934 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-2025-21934? +

CVE-2025-21934 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-2025-21934? +

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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