PT-2025-46610 · Linux+4 · Linux Kernel+4

Published 2025-08-28 · Updated 2026-04-20 · CVE-2025-40135

Positive Technologies (AI Summary)

CVSS v2.0

5.2

Medium

Base vector

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

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

Description A flaw exists in the Linux kernel’s IPv6 implementation within the ip6 xmit() function. The issue stems from a use-after-free condition that can occur due to improper handling of device pointers. Utilizing Read-Copy-Update (RCU) in ip6 xmit() and employing dst dev rcu() helps mitigate this condition.

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

Exploit

Use After Free

Weakness Enumeration

CWE-416

CWE-825

Related Identifiers

ALSA-2026:1690

ALSA-2026:2212

ALSA-2026:2264

ALSA-2026:2378

AZL-69995

BDU:2025-16147

CVE-2025-40135

ECHO-77D9-BCE2-A130

OPENSUSE-SU-2025:20172-1

RHSA-2026:1690

RHSA-2026:2212

RHSA-2026:2264

RHSA-2026:2378

SUSE-SU-2026:0278-1

SUSE-SU-2026:0281-1

SUSE-SU-2026:0293-1

SUSE-SU-2026:0315-1

SUSE-SU-2026:0316-1

SUSE-SU-2026:20012-1

SUSE-SU-2026:20015-1

SUSE-SU-2026:20021-1

SUSE-SU-2026:20477-1

SUSE-SU-2026:20498-1

SUSE-SU-2026:20845-1

SUSE-SU-2026:20876-1

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8048-1

Affected Products

Debian

Linuxmint

Linux Kernel

Rocky Linux

Ubuntu

References · 2294

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40135.json · Exploit
• https://ubuntu.com/security/CVE-2025-68314 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40217 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40185 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40174 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40235 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40206 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68320 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40294 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:1690 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40171 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68210 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68239 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40176 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40120 · Vendor Advisory