PT-2025-46633 · Linux+4 · Linux Kernel+4

Published 2025-08-28 · Updated 2026-05-26 · CVE-2025-40158

Positive Technologies (AI Summary)

CVSS v2.0

6.0

Medium

Base vector

AV:L/AC:H/Au:S/C:C/I:C/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 output() function. The issue stems from a use-after-free condition, potentially occurring due to improper handling of memory. The resolution involves utilizing Read-Copy-Update (RCU) to safely access device information via dst dev rcu(). This change aims to prevent the identified use-after-free scenario by ensuring proper synchronization and memory management during IPv6 packet output.

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-825

CWE-416

Related Identifiers

ALSA-2026:1690

ALSA-2026:2212

ALSA-2026:2264

ALSA-2026:2378

AZL-70025

BDU:2025-14755

CVE-2025-40158

ECHO-2E65-B560-5B19

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 · 2287

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40158.json · Exploit
• https://ubuntu.com/security/CVE-2025-40333 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68183 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40119 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8029-3 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40049 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68180 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68201 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40332 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40282 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40080 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40001 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40289 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8029-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40311 · Vendor Advisory