BaseFortify

Publication date: 2025-11-12

Last updated on: 2026-03-25

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_xmit() Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent possible UAF.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-12

Last Modified

2026-03-25

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40135

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves the function ip6_xmit() related to IPv6. The issue was that ip6_xmit() did not use Read-Copy-Update (RCU) mechanisms properly, which could lead to a use-after-free (UAF) condition when accessing dst_dev_rcu(). The fix involved using RCU in ip6_xmit() to prevent this potential UAF vulnerability.

Impact Analysis

The vulnerability could lead to a use-after-free condition in the Linux kernel's IPv6 transmission function, which might cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service. This could impact the reliability and security of systems running vulnerable Linux kernel versions.

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