PT-2025-8808 · Linux+6 · Linux Kernel+6

Frank Sorenson + 1 · Published 2025-01-20 · Updated 2026-04-20 · CVE-2025-21725

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.13.0-rc7

Description A vulnerability in the Linux kernel has been resolved, which occurred when the NETWORK INTERFACE INFO::LinkSpeed was not set by the server, causing the client to handle any values and potentially leading to a divide error. The issue was fixed by setting cifs server iface::speed to a default value of 1Gbps when the link speed is unset.

Recommendations For Linux kernel versions prior to 6.13.0-rc7, set cifs server iface::speed to a sane value, such as 1Gbps, by default when link speed is unset to prevent the divide error.

Exploit

Fix

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

BDU:2025-12006

CVE-2025-21725

DLA-4102-1

OESA-2025-1339

OESA-2025-1340

OPENSUSE-SU-2025_0847-1

OPENSUSE-SU-2025_0856-1

OPENSUSE-SU-2025_0955-1

SUSE-SU-2025:01919-1

SUSE-SU-2025:0847-1

SUSE-SU-2025:0856-1

SUSE-SU-2025:0955-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_0847-1

SUSE-SU-2025_0856-1

SUSE-SU-2025_0955-1

USN-7521-1

USN-7521-2

USN-7521-3

USN-7651-1

USN-7651-2

USN-7651-3

USN-7651-4

USN-7651-5

USN-7651-6

USN-7652-1

USN-7653-1

USN-7737-1

Affected Products

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 1580

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21725.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-21828 · Security Note
• https://ubuntu.com/security/CVE-2024-57997 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21727 · Security Note
• https://ubuntu.com/security/notices/USN-7651-6 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21727 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21721 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21716 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21871 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37798 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-57838 · Security Note
• https://ubuntu.com/security/CVE-2025-21725 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21745 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-2312 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-56785 · Security Note