CVE-2025-39827
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: include node references in rose_neigh refcount Current implementation maintains two separate reference counting mechanisms: the 'count' field in struct rose_neigh tracks references from rose_node structures, while the 'use' field (now refcount_t) tracks references from rose_sock. This patch merges these two reference counting systems using 'use' field for proper reference management. Specifically, this patch adds incrementing and decrementing of rose_neigh->use when rose_neigh->count is incremented or decremented. This patch also modifies rose_rt_free(), rose_rt_device_down() and rose_clear_route() to properly release references to rose_neigh objects before freeing a rose_node through rose_remove_node(). These changes ensure rose_neigh structures are properly freed only when all references, including those from rose_node structures, are released. As a result, this resolves a slab-use-after-free issue reported by Syzbot.
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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-2025-39827
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 is a slab-use-after-free issue in the Linux kernel's rose network protocol implementation. It arises because two separate reference counting mechanisms for rose_neigh structures were not properly synchronized, leading to premature freeing of these structures while they were still in use. The patch merges these reference counts to ensure rose_neigh objects are only freed when all references, including those from rose_node structures, are released, preventing use-after-free errors.

Impact Analysis

The vulnerability can cause use-after-free errors in the Linux kernel's rose network protocol, potentially leading to system instability, crashes, or security issues such as memory corruption. This could affect the reliability and security of systems using the affected kernel component.

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