Linux Kernel Vulnerability in nios2 Configuration Affecting Memory Management
CVE-2025-40245
What is CVE-2025-40245?
A vulnerability in the Linux kernel's nios2 architecture configuration can lead to improper memory management, resulting in kernel paging failures. Specifically, when CONFIG_FLATMEM is set, the kernel relies on memblock_get_current_limit() for determining memory mapping limits. If not properly initialized, this can cause max_low_pfn to exceed max_pfn, leading to persistent kernel panic errors. The introduced patch rectifies the issue by adjusting memblock.current_limit based on upper memory limits, thus preventing unintended memory access and ensuring system stability.
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Affected Version(s)
Linux 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae < 25f09699edd360b534ccae16bc276c3b52c471f3
Linux 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae < 5c3e38a367822f036227dd52bac82dc4a05157e2
Linux 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae