287 lines
14 KiB
JSON
287 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2024-26795",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.178Z",
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"datePublished": "2024-04-04T08:20:25.063Z",
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"dateUpdated": "2026-08-05T11:27:18.433Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:27:18.433Z"
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},
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Sparse-Memory/vmemmap out-of-bounds fix\n\nOffset vmemmap so that the first page of vmemmap will be mapped\nto the first page of physical memory in order to ensure that\nvmemmap’s bounds will be respected during\npfn_to_page()/page_to_pfn() operations.\nThe conversion macros will produce correct SV39/48/57 addresses\nfor every possible/valid DRAM_BASE inside the physical memory limits.\n\nv2:Address Alex's comments"
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"lang": "en",
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"value": "AV:L - The defective `vmemmap` conversion is core arch/MM code exercised through ordinary local syscalls (page faults, mmap, read/write, fork, GUP/DMA setup); it is not reachable as a distinct remote protocol surface. Exploitation therefore requires local execution on the affected RISC-V system.\nAC:L - On an affected RISC-V deployment the out-of-bounds `pfn_to_page()`/`page_to_pfn()` result is deterministic — no race, no memory-layout guessing, no timing window — and any unprivileged memory operation reaches it reliably. Per CVSS 3.1 the vulnerable configuration is assumed, and nothing extra beyond the attacker's control must hold.\nPR:L - No capability, namespace, or admin check guards `pfn_to_page()`/`page_to_pfn()`; a plain unprivileged user process touching pages, mapping memory, or issuing I/O drives the miscomputed conversion. Only a basic local account is needed.\nUI:N - No victim action, mount, or file open is required — the corrupted address computation is hit by the attacker's own ordinary memory operations.\nS:U - The out-of-bounds accesses stay within kernel virtual memory (vmemmap spilling into the adjacent vmalloc region); no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `struct page` accesses land outside the vmemmap region in the vmalloc area holding VMAP_STACK kernel stacks and module data, and `page_to_pfn()` returns wrong PFNs so the wrong physical pages are mapped to userspace or DMA'd — yielding disclosure of arbitrary kernel and other-process memory.\nI:H - The same aliasing gives an out-of-bounds *write*: refcount/flag/mapping updates to `struct page` overwrite vmalloc-region kernel data, and wrong PFNs cause the wrong physical pages to be written, a memory-corruption primitive usable for control-flow hijacking.\nA:H - Overlapping the struct page array with vmalloc allocations and kernel stacks reliably produces oopses, BUG_ONs, and full kernel panics on the affected platform."
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}
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]
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}
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