What is CVE-2025-37863?

CVE-2025-37863 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.6.23 onward and patched in 6.6.88, 6.12.25, 6.14.4 and others. CVE-2025-37863 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-37863?

CVE-2025-37863 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-2025-37863?

Yes, CVE-2025-37863 has been patched. Fixed versions include 6.6.88, 6.12.25, 6.14.4 and others. If you are running Linux kernel 6.6.23 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-37863 actively exploited?

CVE-2025-37863 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-37863

Medium

In the Linux kernel, the following vulnerability has been resolved: ovl: don't allow datadir only In theory overlayfs could support upper layer directly referring to a data layer, but there's no current use case for this. Originally, when data-only layers were introduced, this wasn't allowed, only introduced by the "datadir+" feature, but without actually handling this case, resulting in an Oops. Fix by disallowing datadir without lowerdir.

Package Linux Kernel

Published 2025-05-09

Last modified 2025-11-12

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 6.6.23, 6.7 and later are affected. Fixed in 6.6.88, 6.12.25, 6.14.4, 6.15 and their respective stable series.

Affected from

≥ 6.6.23 ≥ 6.7

Fixed in

✓ 6.6.88 6.6.x ✓ 6.12.25 6.12.x ✓ 6.14.4 6.14.x ✓ 6.15

References

The following references provide additional information about CVE-2025-37863 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/0874b629f65320778e7e3e206177770666d9db18
Patch
Kernel patch commit
https://git.kernel.org/stable/c/21d2ffb0e9838a175064c22f3a9de97d1f56f27d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/b9e3579213ba648fa23f780e8d53e99011c62331
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-37863

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-05-09

Modified 2025-11-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-37863?

CVE-2025-37863 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.6.23 onward and has been patched in 6.6.88, 6.12.25, 6.14.4 and others. CVE-2025-37863 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-37863?

CVE-2025-37863 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-2025-37863?

Yes — CVE-2025-37863 has been patched. Fixed versions include 6.6.88, 6.12.25, 6.14.4 and others. If you are running Linux kernel 6.6.23 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-37863 actively exploited?

No — CVE-2025-37863 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.