PT-2025-49066 · Linux+3 · Linux Kernel+3

Published 2025-10-21 · Updated 2026-02-24 · CVE-2025-40239

Positive Technologies (AI Summary)

CVSS v2.0

4.4

Medium

Base vector

AV:L/AC:M/Au:S/C:N/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 the LAN8814 network PHY. Specifically, the shared->phydev pointer is not always initialized during the PTP probe, leading to a potential NULL pointer dereference when handling interrupts, particularly within the lan8814 gpio process cap function. This can cause a kernel crash. The issue arises because shared->phydev is unconditionally used even if it hasn't been set, resulting in the error.

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

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-02959

CVE-2025-40239

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

Affected Products

Lan8814

Linuxmint

Linux Kernel

Ubuntu

References · 858

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40239.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-40239 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40217 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40166 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40063 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40035 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40049 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40185 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68246 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68200 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40045 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40229 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40053 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40193 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40244 · Vendor Advisory