{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35987", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.145Z", "datePublished": "2024-05-20T09:47:53.717Z", "dateUpdated": "2026-08-05T11:31:25.006Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:25.006Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/include/asm/page.h", "arch/riscv/mm/init.c" ], "versions": [ { "version": "3335068f87217ea59d08f462187dc856652eea15", "lessThan": "b008e327fa570aca210f98c817757649bae56694", "status": "affected", "versionType": "git" }, { "version": "3335068f87217ea59d08f462187dc856652eea15", "lessThan": "ea6628e4e2353978af7e3b4ad4fdaab6149acf3d", "status": "affected", "versionType": "git" }, { "version": "3335068f87217ea59d08f462187dc856652eea15", "lessThan": "aea702dde7e9876fb00571a2602f25130847bf0f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/include/asm/page.h", "arch/riscv/mm/init.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.30", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.9", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.8.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b008e327fa570aca210f98c817757649bae56694" }, { "url": "https://git.kernel.org/stable/c/ea6628e4e2353978af7e3b4ad4fdaab6149acf3d" }, { "url": "https://git.kernel.org/stable/c/aea702dde7e9876fb00571a2602f25130847bf0f" } ], "title": "riscv: Fix loading 64-bit NOMMU kernels past the start of RAM", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35987", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-21T15:11:39.923129Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:34:49.643Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:30:12.480Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/b008e327fa570aca210f98c817757649bae56694", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/ea6628e4e2353978af7e3b4ad4fdaab6149acf3d", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/aea702dde7e9876fb00571a2602f25130847bf0f", "tags": [ "x_transferred" ] } ] } ] } }