CVE-2025-40245
Vulnerability Scoring
Analysis In Progress
CVE-2025-40245 Vulnerability Analysis & Exploit Details
CVE-2025-40245
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-2025-40245 Details
Status: Awaiting Analysis
Published on: 04 Dec 2025, 16:16 UTC
CVSS Release:
CVE-2025-40245 Vulnerability Summary
CVE-2025-40245: In the Linux kernel, the following vulnerability has been resolved: nios2: ensure that memblock.current_limit is set when setting pfn limits On nios2, with CONFIG_FLATMEM set, the kernel relies on memblock_get_current_limit() to determine the limits of mem_map, in particular for max_low_pfn. Unfortunately, memblock.current_limit is only default initialized to MEMBLOCK_ALLOC_ANYWHERE at this point of the bootup, potentially leading to situations where max_low_pfn can erroneously exceed the value of max_pfn and, thus, the valid range of available DRAM. This can in turn cause kernel-level paging failures, e.g.: [ 76.900000] Unable to handle kernel paging request at virtual address 20303000 [ 76.900000] ea = c0080890, ra = c000462c, cause = 14 [ 76.900000] Kernel panic - not syncing: Oops [ 76.900000] ---[ end Kernel panic - not syncing: Oops ]--- This patch fixes this by pre-calculating memblock.current_limit based on the upper limits of the available memory ranges via adjust_lowmem_bounds, a simplified version of the equivalent implementation within the arm architecture.
Assessing the Risk of CVE-2025-40245
Access Complexity Graph
The exploitability of CVE-2025-40245 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-2025-40245
No exploitability data is available for CVE-2025-40245.
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-2025-40245, 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-2025-40245, 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-2025-40245 does not compromise confidentiality.
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Integrity:
None
CVE-2025-40245 does not impact data integrity.
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Availability:
None
CVE-2025-40245 does not affect system availability.
CVE-2025-40245 References
External References
- https://git.kernel.org/stable/c/25f09699edd360b534ccae16bc276c3b52c471f3
- https://git.kernel.org/stable/c/5c3e38a367822f036227dd52bac82dc4a05157e2
- https://git.kernel.org/stable/c/8912814f14e298b83df072fecc1f7ed1b63b1b2c
- https://git.kernel.org/stable/c/90f5f715550e07cd6a51f80fc3f062d832c8c997
- https://git.kernel.org/stable/c/a20b83cf45be2057f3d073506779e52c7fa17f94
- https://git.kernel.org/stable/c/b1ec9faef7e36269ca3ec890972a78effbaeb975
CWE Common Weakness Enumeration
Unknown
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