What is CVE-2025-21998?

CVE-2025-21998 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10, affecting Linux kernel versions from 6.11 onward and patched in 6.12.21, 6.13.9 and 6.14. CVE-2025-21998 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21998?

CVE-2025-21998 has a CVSS score of 4.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-21998?

Yes, CVE-2025-21998 has been patched. Fixed versions include 6.12.21, 6.13.9 and 6.14. If you are running Linux kernel 6.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21998 actively exploited?

CVE-2025-21998 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-21998

Medium

In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: uefisecapp: fix efivars registration race Since the conversion to using the TZ allocator, the efivars service is registered before the memory pool has been allocated, something which can lead to a NULL-pointer dereference in case of a racing EFI variable access. Make sure that all resources have been set up before registering the efivars.

Package Linux Kernel

Published 2025-04-03

Last modified 2025-10-01

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

4.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-367

CVE-2025-21998 is classified as CWE-367

See CWE-367 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.11 and later are affected. Fixed in 6.12.21, 6.13.9, 6.14 and their respective stable series.

Affected from

≥ 6.11

Fixed in

✓ 6.12.21 6.12.x ✓ 6.13.9 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21998 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/c4e37b381a7a243c298a4858fc0a5a74e737c79a
Patch
Kernel patch commit
https://git.kernel.org/stable/c/da8d493a80993972c427002684d0742560f3be4a
Patch
Kernel patch commit
https://git.kernel.org/stable/c/f15a2b96a0e41c426c63a932d0e63cde7b9784aa
Patch

Details

CVE ID CVE-2025-21998

Severity Medium

CVSS score 4.7 / 10

CVSS version 3.1

Published 2025-04-03

Modified 2025-10-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21998?

CVE-2025-21998 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 . It affects Linux kernel versions from 6.11 onward and has been patched in 6.12.21, 6.13.9 and 6.14. CVE-2025-21998 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21998?

CVE-2025-21998 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-21998?

Yes — CVE-2025-21998 has been patched. Fixed versions include 6.12.21, 6.13.9 and 6.14. If you are running Linux kernel 6.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21998 actively exploited?

No — CVE-2025-21998 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.