What is CVE-2025-37891?

CVE-2025-37891 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.5 onward and patched in 6.6.90, 6.12.28, 6.14.6 and others. CVE-2025-37891 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-37891?

CVE-2025-37891 has a CVSS score of 7.8 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:H/A:H.

Is there a patch available for CVE-2025-37891?

Yes, CVE-2025-37891 has been patched. Fixed versions include 6.6.90, 6.12.28, 6.14.6 and others. If you are running Linux kernel 6.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-37891 actively exploited?

CVE-2025-37891 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-37891

High

In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: Fix buffer overflow at UMP SysEx message conversion The conversion function from MIDI 1.0 to UMP packet contains an internal buffer to keep the incoming MIDI bytes, and its size is 4, as it was supposed to be the max size for a MIDI1 UMP packet data. However, the implementation overlooked that SysEx is handled in a different format, and it can be up to 6 bytes, as found in do_convert_to_ump(). It leads eventually to a buffer overflow, and may corrupt the memory when a longer SysEx message is received. The fix is simply to extend the buffer size to 6 to fit with the SysEx UMP message.

Package Linux Kernel

Published 2025-05-19

Last modified 2025-11-17

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-120

CVE-2025-37891 is classified as CWE-120

See CWE-120 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.5 and later are affected. Fixed in 6.6.90, 6.12.28, 6.14.6, 6.15 and their respective stable series.

Affected from

≥ 6.5

Fixed in

✓ 6.6.90 6.6.x ✓ 6.12.28 6.12.x ✓ 6.14.6 6.14.x ✓ 6.15

References

The following references provide additional information about CVE-2025-37891 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/226beac5605afbb33f8782148d188b64396145a4
Patch
Kernel patch commit
https://git.kernel.org/stable/c/42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fe
Patch
Kernel patch commit
https://git.kernel.org/stable/c/56f1f30e6795b890463d9b20b11e576adf5a2f77
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-37891

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-05-19

Modified 2025-11-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-37891?

CVE-2025-37891 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 6.5 onward and has been patched in 6.6.90, 6.12.28, 6.14.6 and others. CVE-2025-37891 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-37891?

CVE-2025-37891 has a CVSS score of 7.8 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:H/A:H.
Is there a patch available for CVE-2025-37891?

Yes — CVE-2025-37891 has been patched. Fixed versions include 6.6.90, 6.12.28, 6.14.6 and others. If you are running Linux kernel 6.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-37891 actively exploited?

No — CVE-2025-37891 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.