BaseFortify

Publication date: 2025-10-28

Last updated on: 2025-10-30

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: start using dst_dev_rcu() Change icmpv4_xrlim_allow(), ip_defrag() to prevent possible UAF. Change ipmr_prepare_xmit(), ipmr_queue_fwd_xmit(), ip_mr_output(), ipv4_neigh_lookup() to use lockdep enabled dst_dev_rcu().

CVSS Scores

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Meta Information

Published

2025-10-28

Last Modified

2025-10-30

Generated

2026-07-06

AI Q&A

2025-10-28

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40074

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves improper handling of certain IPv4 functions, specifically related to the use of dst_dev_rcu() and changes to functions like icmpv4_xrlim_allow() and ip_defrag() to prevent possible use-after-free (UAF) issues. It also involves updates to multicast routing and neighbor lookup functions to use lockdep enabled dst_dev_rcu(), which improves memory safety and concurrency handling.

Impact Analysis

The vulnerability could lead to use-after-free conditions in the Linux kernel's IPv4 networking code, potentially causing system crashes, instability, or allowing an attacker to execute arbitrary code or escalate privileges if exploited.

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