What is CVE-2025-21815?

CVE-2025-21815 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 6.7 onward and patched in 6.12.14, 6.13.3 and 6.14. CVE-2025-21815 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21815?

CVE-2025-21815 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2025-21815?

Yes, CVE-2025-21815 has been patched. Fixed versions include 6.12.14, 6.13.3 and 6.14. If you are running Linux kernel 6.7 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21815 actively exploited?

CVE-2025-21815 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2025-21815

High

In the Linux kernel, the following vulnerability has been resolved: mm/compaction: fix UBSAN shift-out-of-bounds warning syzkaller reported a UBSAN shift-out-of-bounds warning of (1UL << order) in isolate_freepages_block(). The bogus compound_order can be any value because it is union with flags. Add back the MAX_PAGE_ORDER check to fix the warning.

Package Linux Kernel

Published 2025-02-27

Last modified 2025-10-28

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2025-21815 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.7 and later are affected. Fixed in 6.12.14, 6.13.3, 6.14 and their respective stable series.

Affected from

≥ 6.7

Fixed in

✓ 6.12.14 6.12.x ✓ 6.13.3 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21815 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/10b7d3eb535098ccd4c82a182a33655d8a0e5c88
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4491159774d973a9e2e998d25d8fbb20fada6dfa
Patch
Kernel patch commit
https://git.kernel.org/stable/c/d1366e74342e75555af2648a2964deb2d5c92200
Patch

Details

CVE ID CVE-2025-21815

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2025-02-27

Modified 2025-10-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21815?

CVE-2025-21815 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 6.7 onward and has been patched in 6.12.14, 6.13.3 and 6.14. CVE-2025-21815 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21815?

CVE-2025-21815 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2025-21815?

Yes — CVE-2025-21815 has been patched. Fixed versions include 6.12.14, 6.13.3 and 6.14. If you are running Linux kernel 6.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21815 actively exploited?

No — CVE-2025-21815 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. View CWE-125 on MITRE CWE →