227 lines
12 KiB
JSON
227 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-2024-35993",
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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": "2024-05-17T13:50:33.147Z",
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"datePublished": "2024-05-20T09:47:57.739Z",
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"dateUpdated": "2026-08-05T11:31:27.140Z"
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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": "2026-08-05T11:31:27.140Z"
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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\nmm: turn folio_test_hugetlb into a PageType\n\nThe current folio_test_hugetlb() can be fooled by a concurrent folio split\ninto returning true for a folio which has never belonged to hugetlbfs. \nThis can't happen if the caller holds a refcount on it, but we have a few\nplaces (memory-failure, compaction, procfs) which do not and should not\ntake a speculative reference.\n\nSince hugetlb pages do not use individual page mapcounts (they are always\nfully mapped and use the entire_mapcount field to record the number of\nmappings), the PageType field is available now that page_mapcount()\nignores the value in this field.\n\nIn compaction and with CONFIG_DEBUG_VM enabled, the current implementation\ncan result in an oops, as reported by Luis. This happens since 9c5ccf2db04b\n(\"mm: remove HUGETLB_PAGE_DTOR\") effectively added some VM_BUG_ON() checks\nin the PageHuge() testing path.\n\n[willy@infradead.org: update vmcoreinfo]"
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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:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 vulnerability is in core MM page-flag accessors reached via compaction, memory-failure and procfs; triggering it requires local execution to allocate/split THPs and drive compaction scans. There is no remote or adjacent-network path to this code.\nAC:L - This is a race the attacker creates on both sides — one set of threads forces THP splits via madvise(MADV_DONTNEED)/partial munmap while another drives compaction (memory pressure, THP faults, or CMA/dma-buf allocations), and compaction scans millions of PFNs per second, so the narrow window between the two loads is retried continuously at no cost.\nPR:L - Only an ordinary unprivileged local user is needed: THP allocation and splitting are unprivileged operations, and direct compaction plus alloc_contig_range (CMA/dma-buf heap, v4l2 videobuf2) are reachable from normal userspace on Android and embedded systems without any capability.\nUI:N - The attacker's own threads generate both the folio split and the compaction scan; no victim action or cooperation is required.\nS:U - The type confusion and resulting corruption stay within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - folio_test_hugetlb() misidentifies a THP as a hugetlb folio, causing the kernel to read and interpret THP tail-page fields (_flags_1/_flags_2, _hugetlb_subpool, _hugetlb_hwpoison) as hugetlb metadata; this type confusion and the resulting list/metadata corruption are leverageable for disclosure of kernel memory contents.\nI:H - Type confusion leads to hugetlb machinery mutating non-hugetlb state — isolate_hugetlb() performs list_move_tail() on a THP still on an LRU list and clears bits in folio->private, and folio_set_hugetlb_hwpoison() does llist_add() into fields overlapping a THP's _deferred_list, giving linked-list corruption and a write primitive.\nA:H - isolate_or_dissolve_huge_page() dereferences the NULL hstate returned by size_to_hstate() in hstate_is_gigantic() (h->order), producing a kernel oops, and with CONFIG_DEBUG_VM_PGFLAGS the VM_BUG_ON_PGFLAGS in folio_flags() panics the kernel — the originally reported symptom."
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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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"include/linux/page-flags.h",
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"include/trace/events/mmflags.h",
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"kernel/vmcore_info.c",
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"mm/hugetlb.c"
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],
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"versions": [
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{
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"version": "9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a",
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"lessThan": "2431b5f2650dfc47ce782d1ca7b02d6b3916976f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a",
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"lessThan": "9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "d99e3140a4d33e26066183ff727d8f02f56bec64",
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"status": "affected",
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},
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{
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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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"include/linux/page-flags.h",
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"include/trace/events/mmflags.h",
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"kernel/vmcore_info.c",
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"mm/hugetlb.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.6.30",
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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": "6.6",
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"versionEndExcluding": "6.6.30"
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},
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"references": [
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"url": "https://git.kernel.org/stable/c/2431b5f2650dfc47ce782d1ca7b02d6b3916976f"
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"url": "https://git.kernel.org/stable/c/9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32"
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}
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],
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"title": "mm: turn folio_test_hugetlb into a PageType",
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