CVE-2025-40300
Vulnerability Scoring
Analysis In Progress
CVE-2025-40300 Vulnerability Analysis & Exploit Details
CVE-2025-40300
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-2025-40300 Details
Status: Received on 11 Sep 2025, 17:15 UTC
Published on: 11 Sep 2025, 17:15 UTC
CVSS Release:
CVE-2025-40300 Vulnerability Summary
CVE-2025-40300: In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit. Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB. This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace. The intent is to integrate and optimize these cases post-embargo. [ dhansen: elaborate on suboptimal IBPB solution ]
Assessing the Risk of CVE-2025-40300
Access Complexity Graph
The exploitability of CVE-2025-40300 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-2025-40300
No exploitability data is available for CVE-2025-40300.
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-2025-40300, 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-2025-40300, 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-2025-40300 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40300 does not impact data integrity.
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Availability:
None
CVE-2025-40300 does not affect system availability.
CVE-2025-40300 References
External References
- https://git.kernel.org/stable/c/15006289e5c38b2a830e1fba221977a27598176c
- https://git.kernel.org/stable/c/2f4f2f8f860cb4c3336a7435ebe8dcfded0c9c6e
- https://git.kernel.org/stable/c/34e5667041050711a947e260fc9ebebe08bddee5
- https://git.kernel.org/stable/c/459274c77b37ac63b78c928b4b4e748d1f9d05c8
- https://git.kernel.org/stable/c/510603f504796c3535f67f55fb0b124a303b44c8
- https://git.kernel.org/stable/c/893387c18612bb452336a5881da0d015a7e8f4a2
- https://git.kernel.org/stable/c/9c23a90648e831d611152ac08dbcd1283d405e7f
- https://git.kernel.org/stable/c/ac60717f9a8d21c58617d0b34274babf24135835
- https://git.kernel.org/stable/c/c08192b5d6730a914dee6175bc71092ee6a65f14
- https://git.kernel.org/stable/c/d5490dfa35427a2967e00a4c7a1b95fdbc8ede34
- https://git.kernel.org/stable/c/d7ddc93392e4a7ffcccc86edf6ef3e64c778db52
- https://git.kernel.org/stable/c/f866eef8d1c65504d30923c3f14082ad294d0e6d
CWE Common Weakness Enumeration
Unknown
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