{"cve":"CVE-2024-57945","nvd":{"published":"2025-01-21T13:15:09.033","modified":"2026-08-04T11:22:32.510","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix the out of bound issue of vmemmap address\n\nIn sparse vmemmap model, the virtual address of vmemmap is calculated as:\n((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)).\nAnd the struct page's va can be calculated with an offset:\n(vmemmap + (pfn)).\n\nHowever, when initializing struct pages, kernel actually starts from the\nfirst page from the same section that phys_ram_base belongs to. If the\nfirst page's physical address is not (phys_ram_base >> PAGE_SHIFT), then\nwe get an va below VMEMMAP_START when calculating va for it's struct page.\n\nFor example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the\nfirst page in the same section is actually pfn 0x80000. During\ninit_unavailable_range(), we will initialize struct page for pfn 0x80000\nwith virtual address ((struct page *)VMEMMAP_START - 0x2000), which is\nbelow VMEMMAP_START as well as PCI_IO_END.\n\nThis commit fixes this bug by introducing a new variable\n'vmemmap_start_pfn' which is aligned with memory section size and using\nit to calculate vmemmap address instead of phys_ram_base.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1},"cwes":["CWE-125"],"references":["https://git.kernel.org/stable/c/04350304428063da6a55a8a4597d409dc69148b2","https://git.kernel.org/stable/c/92f08673d3f1893191323572f60e3c62f2e57c2f","https://git.kernel.org/stable/c/a4a7ac3d266008018f05fae53060fcb331151a14","https://git.kernel.org/stable/c/d2bd51954ac8377c2f1eb1813e694788998add66","https://git.kernel.org/stable/c/f754f27e98f88428aaf6be6e00f5cbce97f62d4b"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:58:41.599736885+00:00"},"epss":{"cve":"CVE-2024-57945","score":0.00212,"percentile":0.11512,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}