What is CVE-2025-21748?

CVE-2025-21748 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Integer Overflow flaw (CWE-190), affecting Linux kernel versions from 5.15 onward and patched in 5.15.179, 6.1.129, 6.6.78 and others. CVE-2025-21748 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21748?

CVE-2025-21748 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-2025-21748?

Yes, CVE-2025-21748 has been patched. Fixed versions include 5.15.179, 6.1.129, 6.6.78 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21748 actively exploited?

CVE-2025-21748 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Integer Overflow (CWE-190)?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/190.html

CVE-2025-21748

Medium

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix integer overflows on 32 bit systems On 32bit systems the addition operations in ipc_msg_alloc() can potentially overflow leading to memory corruption. Add bounds checking using KSMBD_IPC_MAX_PAYLOAD to avoid overflow.

Package Linux Kernel

Published 2025-02-27

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-190

CVE-2025-21748 is a Integer Overflow vulnerability

What is Integer Overflow?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.15 and later are affected. Fixed in 5.15.179, 6.1.129, 6.6.78, 6.12.14, 6.13.3, 6.14 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 5.15.179 5.15.x ✓ 6.1.129 6.1.x ✓ 6.6.78 6.6.x ✓ 6.12.14 6.12.x ✓ 6.13.3 6.13.x ✓ 6.14

References

7 total

Kernel Git
https://git.kernel.org/stable/c/760568c1f62ea874e8fb492f9cfa4f47b4b8391e

Patch
Kernel Git
https://git.kernel.org/stable/c/82f59d64e6297f270311b16b5dcf65be406d1ea3

Patch
Kernel Git
https://git.kernel.org/stable/c/aab98e2dbd648510f8f51b83fbf4721206ccae45

Patch
Kernel Git
https://git.kernel.org/stable/c/b4b902737746c490258de5cb55cab39e79927a67

Patch
Kernel Git
https://git.kernel.org/stable/c/ecb9947fa7c99a77b04d43404c6988a0d326e4a0

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2025-21748

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-02-27

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21748?

CVE-2025-21748 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Integer Overflow flaw (CWE-190) . It affects Linux kernel versions from 5.15 onward and has been patched in 5.15.179, 6.1.129, 6.6.78 and others. CVE-2025-21748 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21748?

CVE-2025-21748 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-2025-21748?

Yes. CVE-2025-21748 has been patched. Fixed versions include 5.15.179, 6.1.129, 6.6.78 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21748 actively exploited?

No. CVE-2025-21748 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.