BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-12

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: net: use dst_dev_rcu() in sk_setup_caps() Use RCU to protect accesses to dst->dev from sk_setup_caps() and sk_dst_gso_max_size(). Also use dst_dev_rcu() in ip6_dst_mtu_maybe_forward(), and ip_dst_mtu_maybe_forward(). ip4_dst_hoplimit() can use dst_dev_net_rcu().

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-12

Last Modified

2025-11-12

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40170

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 device pointers (dst->dev) in network-related functions such as sk_setup_caps() and sk_dst_gso_max_size(). The fix uses Read-Copy-Update (RCU) mechanisms to protect these accesses, preventing potential race conditions or use-after-free errors when accessing network device structures.

Impact Analysis

If exploited, this vulnerability could lead to kernel instability or crashes due to improper synchronization when accessing network device data. This might allow attackers to cause denial of service or potentially escalate privileges by exploiting race conditions in the kernel networking code.

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