What is CVE-2025-21667?

CVE-2025-21667 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Infinite Loop flaw (CWE-835), affecting Linux kernel versions from 6.1.92 onward and patched in 6.1.127, 6.6.74, 6.12.11 and others. CVE-2025-21667 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21667?

CVE-2025-21667 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-2025-21667?

Yes, CVE-2025-21667 has been patched. Fixed versions include 6.1.127, 6.6.74, 6.12.11 and others. If you are running Linux kernel 6.1.92 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21667 actively exploited?

CVE-2025-21667 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Infinite Loop (CWE-835)?

The product contains an iteration that does not exit even when it should. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/835.html

CVE-2025-21667

Medium

In the Linux kernel, the following vulnerability has been resolved: iomap: avoid avoid truncating 64-bit offset to 32 bits on 32-bit kernels, iomap_write_delalloc_scan() was inadvertently using a 32-bit position due to folio_next_index() returning an unsigned long. This could lead to an infinite loop when writing to an xfs filesystem.

Package Linux Kernel

Published 2025-01-31

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-835

CVE-2025-21667 is a Infinite Loop vulnerability

What is Infinite Loop?

The product contains an iteration that does not exit even when it should. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.1.92, 6.2 and later are affected. Fixed in 6.1.127, 6.6.74, 6.12.11, 6.13 and their respective stable series.

Affected from

≥ 6.1.92 ≥ 6.2

Fixed in

✓ 6.1.127 6.1.x ✓ 6.6.74 6.6.x ✓ 6.12.11 6.12.x ✓ 6.13

References

5 total

Kernel Git
https://git.kernel.org/stable/c/402ce16421477e27f30b57d6d1a6dc248fa3a4e4

Patch
Kernel Git
https://git.kernel.org/stable/c/7ca4bd6b754913910151acce00be093f03642725

Patch
Kernel Git
https://git.kernel.org/stable/c/91371922704c8d82049ef7c2ad974d0a2cd1174d

Patch
Kernel Git
https://git.kernel.org/stable/c/c13094b894de289514d84b8db56d1f2931a0bade

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

Details

CVE ID CVE-2025-21667

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-01-31

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21667?

CVE-2025-21667 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Infinite Loop flaw (CWE-835) . It affects Linux kernel versions from 6.1.92 onward and has been patched in 6.1.127, 6.6.74, 6.12.11 and others. CVE-2025-21667 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21667?

CVE-2025-21667 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-2025-21667?

Yes. CVE-2025-21667 has been patched. Fixed versions include 6.1.127, 6.6.74, 6.12.11 and others. If you are running Linux kernel 6.1.92 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21667 actively exploited?

No. CVE-2025-21667 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.