{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26795", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.178Z", "datePublished": "2024-04-04T08:20:25.063Z", "dateUpdated": "2026-08-05T11:27:18.433Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:18.433Z" }, "descriptions": [ { "lang": "en", "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" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "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/pgtable.h" ], "versions": [ { "version": "d95f1a542c3df396137afa217ef9bd39cb8931ca", "lessThan": "5941a90c55d3bfba732b32208d58d997600b44ef", "status": "affected", "versionType": "git" }, { "version": "d95f1a542c3df396137afa217ef9bd39cb8931ca", "lessThan": "8310080799b40fd9f2a8b808c657269678c149af", "status": "affected", "versionType": "git" }, { "version": "d95f1a542c3df396137afa217ef9bd39cb8931ca", "lessThan": "a278d5c60f21aa15d540abb2f2da6e6d795c3e6e", "status": "affected", "versionType": "git" }, { "version": "d95f1a542c3df396137afa217ef9bd39cb8931ca", "lessThan": "2a1728c15ec4f45ed9248ae22f626541c179bfbe", "status": "affected", "versionType": "git" }, { "version": "d95f1a542c3df396137afa217ef9bd39cb8931ca", "lessThan": "a11dd49dcb9376776193e15641f84fcc1e5980c9", "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/pgtable.h" ], "versions": [ { "version": "5.4", "status": "affected" }, { "version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.151", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.81", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.21", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.9", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.4", "versionEndExcluding": "5.15.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.1.81" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.6.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.7.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5941a90c55d3bfba732b32208d58d997600b44ef" }, { "url": "https://git.kernel.org/stable/c/8310080799b40fd9f2a8b808c657269678c149af" }, { "url": "https://git.kernel.org/stable/c/a278d5c60f21aa15d540abb2f2da6e6d795c3e6e" }, { "url": "https://git.kernel.org/stable/c/2a1728c15ec4f45ed9248ae22f626541c179bfbe" }, { "url": "https://git.kernel.org/stable/c/a11dd49dcb9376776193e15641f84fcc1e5980c9" } ], "title": "riscv: Sparse-Memory/vmemmap out-of-bounds fix", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-17T19:27:22.580328Z", "id": "CVE-2024-26795", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T19:27:29.143Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:13.470Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8af1c121b0102041809bc137ec600d1865eaeedd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/5941a90c55d3bfba732b32208d58d997600b44ef", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8310080799b40fd9f2a8b808c657269678c149af", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a278d5c60f21aa15d540abb2f2da6e6d795c3e6e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2a1728c15ec4f45ed9248ae22f626541c179bfbe", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a11dd49dcb9376776193e15641f84fcc1e5980c9", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html", "tags": [ "x_transferred" ] } ] } ] }, "dataVersion": "5.2" }