CVE-2025-37797
Vulnerability Scoring
Analysis In Progress
CVE-2025-37797 Vulnerability Analysis & Exploit Details
CVE-2025-37797
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-2025-37797 Details
Status: Awaiting Analysis
Last updated: 🕣 05 May 2025, 20:54 UTC
Originally published on: 🕒 02 May 2025, 15:15 UTC
Time between publication and last update: 3 days
CVSS Release:
CVE-2025-37797 Vulnerability Summary
CVE-2025-37797: In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel. The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continues assuming the queue is still non-empty, adding the class to vttree 4. This breaks HFSC scheduler assumptions that only non-empty classes are in vttree 5. Later, when the class is destroyed, this can lead to a Use-After-Free The fix adds a second queue length check after qdisc_peek_len() to verify the queue wasn't emptied.
Assessing the Risk of CVE-2025-37797
Access Complexity Graph
The exploitability of CVE-2025-37797 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-2025-37797
No exploitability data is available for CVE-2025-37797.
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-2025-37797, 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-2025-37797, 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-2025-37797 does not compromise confidentiality.
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Integrity:
None
CVE-2025-37797 does not impact data integrity.
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Availability:
None
CVE-2025-37797 does not affect system availability.
CVE-2025-37797 References
External References
- https://git.kernel.org/stable/c/20d584a33e480ae80d105f43e0e7b56784da41b9
- https://git.kernel.org/stable/c/28b09a067831f7317c3841812276022d6c940677
- https://git.kernel.org/stable/c/39b9095dd3b55d9b2743df038c32138efa34a9de
- https://git.kernel.org/stable/c/3aa852e3605000d5c47035c3fc3a986d14ccfa9f
- https://git.kernel.org/stable/c/3df275ef0a6ae181e8428a6589ef5d5231e58b5c
- https://git.kernel.org/stable/c/86cd4641c713455a4f1c8e54c370c598c2b1cee0
- https://git.kernel.org/stable/c/bb583c88d23b72d8d16453d24856c99bd93dadf5
- https://git.kernel.org/stable/c/fcc8ede663569c704fb00a702973bd6c00373283
CWE Common Weakness Enumeration
Unknown
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