CVE-2025-39826
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-16

Last updated on: 2025-11-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net: rose: convert 'use' field to refcount_t The 'use' field in struct rose_neigh is used as a reference counter but lacks atomicity. This can lead to race conditions where a rose_neigh structure is freed while still being referenced by other code paths. For example, when rose_neigh->use becomes zero during an ioctl operation via rose_rt_ioctl(), the structure may be removed while its timer is still active, potentially causing use-after-free issues. This patch changes the type of 'use' from unsigned short to refcount_t and updates all code paths to use rose_neigh_hold() and rose_neigh_put() which operate reference counts atomically.
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Meta Information
Published
2025-09-16
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-16
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39826
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel 6.1.153
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability involves the 'use' field in the Linux kernel's rose_neigh structure, which is used as a reference counter but was not handled atomically. Because of this, race conditions could occur where the rose_neigh structure is freed while still being referenced elsewhere, leading to potential use-after-free issues. The vulnerability is fixed by converting the 'use' field to an atomic reference counter type (refcount_t) and updating the code to manage references atomically.

Impact Analysis

This vulnerability can cause race conditions that lead to use-after-free errors in the Linux kernel's networking code. Such errors may result in system instability, crashes, or potentially allow attackers to execute arbitrary code or cause denial of service by exploiting the improper memory handling.

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