CVE-2025-39689
Vulnerability Scoring
Analysis In Progress
CVE-2025-39689 Vulnerability Analysis & Exploit Details
CVE-2025-39689
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2025-39689 Details
Status: Received on 05 Sep 2025, 18:15 UTC
Published on: 05 Sep 2025, 18:15 UTC
CVSS Release:
CVE-2025-39689 Vulnerability Summary
CVE-2025-39689: In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.
Assessing the Risk of CVE-2025-39689
Access Complexity Graph
The exploitability of CVE-2025-39689 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2025-39689
No exploitability data is available for CVE-2025-39689.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2025-39689, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2025-39689, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2025-39689 does not compromise confidentiality.
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Integrity:
None
CVE-2025-39689 does not impact data integrity.
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Availability:
None
CVE-2025-39689 does not affect system availability.
CVE-2025-39689 References
External References
- https://git.kernel.org/stable/c/12064e1880fc9202be75ff668205b1703d92f74f
- https://git.kernel.org/stable/c/3b114a3282ab1a12cb4618a8f45db5d7185e784a
- https://git.kernel.org/stable/c/64db338140d2bad99a0a8c6a118dd60b3e1fb8cb
- https://git.kernel.org/stable/c/a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309
- https://git.kernel.org/stable/c/bfb336cf97df7b37b2b2edec0f69773e06d11955
- https://git.kernel.org/stable/c/c4cd93811e038d19f961985735ef7bb128078dfb
- https://git.kernel.org/stable/c/c591ba1acd081d4980713e47869dd1cc3d963d19
- https://git.kernel.org/stable/c/e0b6b223167e1edde5c82edf38e393c06eda1f13
CWE Common Weakness Enumeration
Unknown
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