CVE-2025-21795
Vulnerability Scoring
Analysis In Progress
CVE-2025-21795 Vulnerability Analysis & Exploit Details
CVE-2025-21795
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-2025-21795 Details
Status: Awaiting Analysis
Last updated: 🕐 13 Mar 2025, 13:15 UTC
Originally published on: 🕒 27 Feb 2025, 03:15 UTC
Time between publication and last update: 14 days
CVSS Release:
CVE-2025-21795 Vulnerability Summary
CVE-2025-21795: In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If nfs4_client is in courtesy state then there is no point to send the callback. This causes nfsd4_shutdown_callback to hang since cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP notifies NFSD that the connection was dropped. This patch modifies nfsd4_run_cb_work to skip the RPC call if nfs4_client is in courtesy state.
Assessing the Risk of CVE-2025-21795
Access Complexity Graph
The exploitability of CVE-2025-21795 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-2025-21795
No exploitability data is available for CVE-2025-21795.
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-2025-21795, 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-2025-21795, 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-2025-21795 does not compromise confidentiality.
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Integrity:
None
CVE-2025-21795 does not impact data integrity.
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Availability:
None
CVE-2025-21795 does not affect system availability.
Exploit Prediction Scoring System (EPSS)
The EPSS score estimates the probability that this vulnerability will be exploited in the near future.
EPSS Score: 0.044% (probability of exploit)
EPSS Percentile: 12.92%
(lower percentile = lower relative risk)
This vulnerability is less risky than approximately 87.08% of others.
CVE-2025-21795 References
External References
- https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03
- https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908
- https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7
- https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239
- https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854
- https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d
- https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221
CWE Common Weakness Enumeration
Unknown
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