223 lines
12 KiB
JSON
223 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-35987",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-17T13:50:33.145Z",
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"datePublished": "2024-05-20T09:47:53.717Z",
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"dateUpdated": "2026-08-05T11:31:25.006Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:31:25.006Z"
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},
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"descriptions": [
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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: Fix loading 64-bit NOMMU kernels past the start of RAM\n\ncommit 3335068f8721 (\"riscv: Use PUD/P4D/PGD pages for the linear\nmapping\") added logic to allow using RAM below the kernel load address.\nHowever, this does not work for NOMMU, where PAGE_OFFSET is fixed to the\nkernel load address. Since that range of memory corresponds to PFNs\nbelow ARCH_PFN_OFFSET, mm initialization runs off the beginning of\nmem_map and corrupts adjacent kernel memory. Fix this by restoring the\nprevious behavior for NOMMU kernels."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The corruption occurs in `setup_bootmem()`/`free_area_init()` on the local machine's own boot path, with no network, adjacent-network, or remote-peer data anywhere in the path; anyone able to power-cycle or reset an affected RISC-V NOMMU board triggers it, and no device insertion or physical bus access is involved, so it scores L rather than P.\nAC:L - On an affected deployment (64-bit RISC-V NOMMU with RAM below the kernel load address) the failure is fully deterministic on every single boot — `min_low_pfn < ARCH_PFN_OFFSET` forces the negative `__pfn_to_page()` index unconditionally, with no race, timing window, or memory-layout grooming required.\nPR:N - The corrupting code runs during early memory-management initialization, long before userspace, login, or any credential check exists, so no account, capability, or namespace gates it.\nUI:N - Both `setup_bootmem()` and mm initialization execute autonomously as part of kernel startup; no administrator or user has to mount anything, open a device node, or take any action.\nS:U - The out-of-bounds writes and the skewed `__va`/`__pa` translation both corrupt the kernel's own memory and allocator state, remaining entirely within the kernel's security authority — no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Corrupted `struct page` metadata and a systematically wrong `kernel_map.va_pa_offset` make `pfn_to_page()`/`page_address()`/`virt_to_phys()` resolve to the wrong physical memory, so the page allocator can hand out pages still holding kernel data; on NOMMU there is no MMU-enforced separation to prevent a user process from reading that kernel memory.\nI:H - `__init_single_page()` writes roughly 64 bytes of page flags, refcounts, and list pointers per PFN at a negative index before `mem_map`, giving an out-of-bounds write into adjacent kernel memory, and the wrong `va_pa_offset` additionally directs DMA and linear-map writes to incorrect physical addresses.\nA:H - The commit states mm initialization \"corrupts adjacent kernel memory\"; the resulting damage to page-allocator structures plus universally wrong physical-address translation renders the system unbootable or crashes it, and recurs on every boot while the affected memory layout is present."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/riscv/include/asm/page.h",
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"arch/riscv/mm/init.c"
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],
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"versions": [
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{
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"version": "3335068f87217ea59d08f462187dc856652eea15",
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"lessThan": "b008e327fa570aca210f98c817757649bae56694",
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"status": "affected",
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"versionType": "git"
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{
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"version": "3335068f87217ea59d08f462187dc856652eea15",
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"lessThan": "ea6628e4e2353978af7e3b4ad4fdaab6149acf3d",
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"status": "affected",
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"status": "affected",
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/riscv/include/asm/page.h",
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"arch/riscv/mm/init.c"
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],
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"versions": [
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{
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"version": "6.4",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.4",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.30",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.8.9",
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"lessThanOrEqual": "6.8.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"versionStartIncluding": "6.4",
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"versionEndExcluding": "6.6.30"
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},
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}
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"title": "riscv: Fix loading 64-bit NOMMU kernels past the start of RAM",
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