CVE-2025-39872
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-23

Last updated on: 2025-12-12

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: hsr: hold rcu and dev lock for hsr_get_port_ndev hsr_get_port_ndev calls hsr_for_each_port, which need to hold rcu lock. On the other hand, before return the port device, we need to hold the device reference to avoid UaF in the caller function.
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Meta Information
Published
2025-09-23
Last Modified
2025-12-12
Generated
2026-06-16
AI Q&A
2025-09-23
EPSS Evaluated
2026-06-14
NVD
CVE-2025-39872
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.14 (inc) to 6.16.8 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
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Exploitability
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CWE ID Description
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Executive Summary

This vulnerability involves the Linux kernel's hsr (High-availability Seamless Redundancy) module. Specifically, the function hsr_get_port_ndev calls hsr_for_each_port, which requires holding an RCU (Read-Copy-Update) lock. Additionally, before returning the port device, the device reference must be held to avoid a Use-after-Free (UaF) condition in the caller function. The vulnerability was resolved by ensuring that both the RCU lock and the device lock are held properly during this operation.

Impact Analysis

If exploited, this vulnerability could lead to a Use-after-Free (UaF) condition in the Linux kernel's hsr module. UaF vulnerabilities can cause system instability, crashes, or potentially allow an attacker to execute arbitrary code with kernel privileges, leading to a compromise of system security.

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