CVE-2025-21690: linux kernel DoS — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Ratelimit warning logs to prevent VM denial of service If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU utilization, preventing troubleshooting from the VM side. Ratelimit the warning so it doesn't DoS the VM.

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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

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.15.178
linux	linux_kernel	5.16 — 6.1.128
linux	linux_kernel	6.2 — 6.6.75
linux	linux_kernel	6.7 — 6.12.12
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
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/01d1ebdab9ccb73c952e1666a8a80abd194dbc55 https://git.kernel.org/stable/c/088bde862f8d3d0fc52e40e66a0484a246837087 https://git.kernel.org/stable/c/182a4b7c731e95c08cb47f14b87a272b6ab2b2da https://git.kernel.org/stable/c/81d4dd05c412ba04f9f6b85b718e6da833be290c https://git.kernel.org/stable/c/d0f0af1bafef33b3e2aa8c3a4ef44db48df9b0ea https://git.kernel.org/stable/c/d2138eab8cde61e0e6f62d0713e45202e8457d6d

Other References

https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

Frequently Asked Questions

What is CVE-2025-21690? +

In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Ratelimit warning logs to prevent VM denial of service If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU utilization, preventing troubleshooting from the VM side. Ratelimit the warning so it doesn't DoS the VM. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21690? +

CVE-2025-21690 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-2025-21690? +

CVE-2025-21690 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-2025-21690? +

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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CVE-2025-21690