What is CVE-2025-21894?

CVE-2025-21894 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.3 onward and patched in 6.6.83, 6.12.18, 6.13.6 and others. CVE-2025-21894 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21894?

CVE-2025-21894 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-2025-21894?

Yes, CVE-2025-21894 has been patched. Fixed versions include 6.6.83, 6.12.18, 6.13.6 and others. If you are running Linux kernel 5.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21894 actively exploited?

CVE-2025-21894 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-21894

Medium

In the Linux kernel, the following vulnerability has been resolved: net: enetc: VFs do not support HWTSTAMP_TX_ONESTEP_SYNC Actually ENETC VFs do not support HWTSTAMP_TX_ONESTEP_SYNC because only ENETC PF can access PMa_SINGLE_STEP registers. And there will be a crash if VFs are used to test one-step timestamp, the crash log as follows. [ 129.110909] Unable to handle kernel paging request at virtual address 00000000000080c0 [ 129.287769] Call trace: [ 129.290219] enetc_port_mac_wr+0x30/0xec (P) [ 129.294504] enetc_start_xmit+0xda4/0xe74 [ 129.298525] enetc_xmit+0x70/0xec [ 129.301848] dev_hard_start_xmit+0x98/0x118

Package Linux Kernel

Published 2025-04-01

Last modified 2025-10-31

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

Affected versions

Linux kernel versions 5.3 and later are affected. Fixed in 6.6.83, 6.12.18, 6.13.6, 6.14 and their respective stable series.

Affected from

≥ 5.3

Fixed in

✓ 6.6.83 6.6.x ✓ 6.12.18 6.12.x ✓ 6.13.6 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21894 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1748531839298ab7be682155f6cd98ae04773e6a
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3d9634211121700568d0e3635ebdd5df06d20440
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8c393efd7420cc994864d059fcc6219bfd7cb840
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-21894

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-04-01

Modified 2025-10-31

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21894?

CVE-2025-21894 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.3 onward and has been patched in 6.6.83, 6.12.18, 6.13.6 and others. CVE-2025-21894 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21894?

CVE-2025-21894 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-2025-21894?

Yes — CVE-2025-21894 has been patched. Fixed versions include 6.6.83, 6.12.18, 6.13.6 and others. If you are running Linux kernel 5.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21894 actively exploited?

No — CVE-2025-21894 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.