{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35993", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.147Z", "datePublished": "2024-05-20T09:47:57.739Z", "dateUpdated": "2026-08-05T11:31:27.140Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:27.140Z" }, "descriptions": [ { "lang": "en", "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]" } ], "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 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/page-flags.h", "include/trace/events/mmflags.h", "kernel/vmcore_info.c", "mm/hugetlb.c" ], "versions": [ { "version": "9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a", "lessThan": "2431b5f2650dfc47ce782d1ca7b02d6b3916976f", "status": "affected", "versionType": "git" }, { "version": "9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a", "lessThan": "9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32", "status": "affected", "versionType": "git" }, { "version": "9c5ccf2db04b8d7c3df363fdd4856c2b79ab2c6a", "lessThan": "d99e3140a4d33e26066183ff727d8f02f56bec64", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/page-flags.h", "include/trace/events/mmflags.h", "kernel/vmcore_info.c", "mm/hugetlb.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "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": "6.6", "versionEndExcluding": "6.6.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.8.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2431b5f2650dfc47ce782d1ca7b02d6b3916976f" }, { "url": "https://git.kernel.org/stable/c/9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32" }, { "url": "https://git.kernel.org/stable/c/d99e3140a4d33e26066183ff727d8f02f56bec64" } ], "title": "mm: turn folio_test_hugetlb into a PageType", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35993", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-20T14:06:03.625705Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:33:44.623Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:30:12.237Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/2431b5f2650dfc47ce782d1ca7b02d6b3916976f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d99e3140a4d33e26066183ff727d8f02f56bec64", "tags": [ "x_transferred" ] } ] } ] } }