143 lines
8.1 KiB
JSON
143 lines
8.1 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-2026-93066",
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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": "2026-09-17T15:57:05.660Z",
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"datePublished": "2026-09-17T16:10:51.612Z",
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"dateUpdated": "2026-10-19T09:05:02.188Z"
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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": "2026-10-19T09:05:02.188Z"
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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\nx86/mm/pat: Take cpa_lock around large-page collapse\n\nLoading and unloading modules concurrently on several CPUs on a KASAN\nbuild, with a short delay injected at the CPA page-table lookup to\nwiden the window, faults within minutes:\n\n BUG: KASAN: use-after-free in __change_page_attr+0x7cc/0x7e0\n Write of size 8 at addr ffff888181139718 by task modprobe\n ...\n The buggy address belongs to the physical page:\n pfn:0x181139 ... page_type: f2(table)\n\ncpa_collapse_large_pages() rebuilds a leaf PMD from its 4K PTEs and\nfrees the old PTE-table pages, while __change_page_attr() fetches a\nPTE pointer from a lockless lookup_address_in_pgd_attr() and writes\nit with set_pte_atomic() only later. When module text is served from\na shared large ROX mapping the two run on the same PMD:\n\n CPU A (module load) CPU B (module finalize)\n ------------------- -----------------------\n execmem_make_temp_rw\n set_memory_nx\n __change_page_attr\n split 2M -> 4K table P\n kpte = &P[i] (lockless)\n execmem_restore_rox\n set_memory_rox (CPA_COLLAPSE)\n cpa_collapse_large_pages\n rebuild leaf PMD\n flush_tlb_all\n pagetable_free(P)\n set_pte_atomic(kpte, ...)\n -> writes into freed P\n\nP is a page-table page (page_type: table), reused at once, so the\nwrite corrupts whatever got the page next: a bad-pte or bad-page\nsplat, or a fatal fault once P has been turned into read-only text.\n\nThe flush_tlb_all() before the free does not close this: its IPI only\nserializes against page-table walkers that run with interrupts off\n(e.g. GUP-fast); the walk in __change_page_attr() runs with interrupts\non, so nothing stops it from holding a stale pointer into P.\n\nSerialize the collapse - the PMD rebuild, TLB flush and PTE-table\nfree - under cpa_lock, the same lock __change_page_attr() now takes\nunconditionally since commit (\"x86/mm/pat: stop gating cpa_lock on\ndebug_pagealloc_enabled()\"), so a concurrent walker can no longer\nhold a pointer into a table the collapse is about to free."
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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/x86/mm/pat/set_memory.c"
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],
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"versions": [
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{
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"version": "41d88484c71cd4f659348da41b7b5b3dbd3be1f6",
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"lessThan": "591b6fac9df3f43522e8ff6eed8662f8b6f1a124",
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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": "41d88484c71cd4f659348da41b7b5b3dbd3be1f6",
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"lessThan": "fb97d1d6c20692e15247fa5c8b894b2325e38aee",
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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": "41d88484c71cd4f659348da41b7b5b3dbd3be1f6",
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"lessThan": "1aac65f3e651334259ecb2a5f5ddb81c01f02599",
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"status": "affected",
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"versionType": "git"
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}
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]
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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/x86/mm/pat/set_memory.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.52"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/591b6fac9df3f43522e8ff6eed8662f8b6f1a124"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb97d1d6c20692e15247fa5c8b894b2325e38aee"
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},
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{
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"url": "https://git.kernel.org/stable/c/1aac65f3e651334259ecb2a5f5ddb81c01f02599"
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}
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],
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"title": "x86/mm/pat: Take cpa_lock around large-page collapse",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |