PT-2025-49035 · Linux+3 · Linux Kernel+3

Published 2025-07-22 · Updated 2026-05-07 · CVE-2025-40221

Positive Technologies (AI Summary)

CVSS v2.0

5.5

Medium

Base vector

AV:L/AC:H/Au:S/C:C/I:N/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel related to uninitialized data. Specifically, the issue involves a potential leak of uninitialized stack data to userspace within the media subsystem, specifically the pci/mg4b driver. The problem stems from the scan structure not being zeroed before use.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Access of Uninitialized Pointer

Weakness Enumeration

CWE-824

Related Identifiers

BDU:2026-02790

CVE-2025-40221

OPENSUSE-SU-2026:20145-1

SUSE-SU-2026:20207-1

SUSE-SU-2026:20220-1

SUSE-SU-2026:20228-1

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8048-1

USN-8095-1

USN-8095-2

USN-8095-3

USN-8095-4

USN-8095-5

USN-8100-1

USN-8125-1

USN-8126-1

USN-8165-1

USN-8261-1

Affected Products

Linuxmint

Linux Kernel

Ubuntu

Pci/Mg4B

References · 2029

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40221.json · Exploit
• https://ubuntu.com/security/CVE-2025-38055 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40092 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21833 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39788 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38251 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38543 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8030-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40284 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40307 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37844 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68264 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38677 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38699 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23207 · Vendor Advisory