What is CVE-2025-21690?

CVE-2025-21690 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.5 onward and patched in 5.15.178, 6.1.128, 6.6.75 and others. CVE-2025-21690 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21690?

CVE-2025-21690 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-21690?

Yes, CVE-2025-21690 has been patched. Fixed versions include 5.15.178, 6.1.128, 6.6.75 and others. If you are running Linux kernel 4.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21690 actively exploited?

CVE-2025-21690 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-21690

Medium

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.

Package Linux Kernel

Published 2025-02-10

Last modified 2025-11-03

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-770

CVE-2025-21690 is classified as CWE-770

See CWE-770 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.5 and later are affected. Fixed in 5.15.178, 6.1.128, 6.6.75, 6.12.12, 6.13.1, 6.14 and their respective stable series.

Affected from

≥ 4.5

Fixed in

✓ 5.15.178 5.15.x ✓ 6.1.128 6.1.x ✓ 6.6.75 6.6.x ✓ 6.12.12 6.12.x ✓ 6.13.1 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21690 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Debian Security
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
Kernel patch commit
https://git.kernel.org/stable/c/01d1ebdab9ccb73c952e1666a8a80abd194dbc55
Patch
Kernel patch commit
https://git.kernel.org/stable/c/088bde862f8d3d0fc52e40e66a0484a246837087
Patch
Kernel patch commit
https://git.kernel.org/stable/c/182a4b7c731e95c08cb47f14b87a272b6ab2b2da
Patch

6 patch commits total View all on NVD

Details

CVE ID CVE-2025-21690

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-02-10

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21690?

CVE-2025-21690 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.5 onward and has been patched in 5.15.178, 6.1.128, 6.6.75 and others. CVE-2025-21690 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21690?

CVE-2025-21690 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-21690?

Yes — CVE-2025-21690 has been patched. Fixed versions include 5.15.178, 6.1.128, 6.6.75 and others. If you are running Linux kernel 4.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21690 actively exploited?

No — CVE-2025-21690 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.