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"cveId": "CVE-2025-39845",
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"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.141Z",
"datePublished": "2025-09-19T15:26:19.225Z",
"dateUpdated": "2026-07-14T12:43:01.152Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()\n\nDefine ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to ensure\npage tables are properly synchronized when calling p*d_populate_kernel().\n\nFor 5-level paging, synchronization is performed via\npgd_populate_kernel(). In 4-level paging, pgd_populate() is a no-op, so\nsynchronization is instead performed at the P4D level via\np4d_populate_kernel().\n\nThis fixes intermittent boot failures on systems using 4-level paging and\na large amount of persistent memory:\n\n BUG: unable to handle page fault for address: ffffe70000000034\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] SMP NOPTI\n RIP: 0010:__init_single_page+0x9/0x6d\n Call Trace:\n \n __init_zone_device_page+0x17/0x5d\n memmap_init_zone_device+0x154/0x1bb\n pagemap_range+0x2e0/0x40f\n memremap_pages+0x10b/0x2f0\n devm_memremap_pages+0x1e/0x60\n dev_dax_probe+0xce/0x2ec [device_dax]\n dax_bus_probe+0x6d/0xc9\n [... snip ...]\n \n\nIt also fixes a crash in vmemmap_set_pmd() caused by accessing vmemmap\nbefore sync_global_pgds() [1]:\n\n BUG: unable to handle page fault for address: ffffeb3ff1200000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI\n Tainted: [W]=WARN\n RIP: 0010:vmemmap_set_pmd+0xff/0x230\n \n vmemmap_populate_hugepages+0x176/0x180\n vmemmap_populate+0x34/0x80\n __populate_section_memmap+0x41/0x90\n sparse_add_section+0x121/0x3e0\n __add_pages+0xba/0x150\n add_pages+0x1d/0x70\n memremap_pages+0x3dc/0x810\n devm_memremap_pages+0x1c/0x60\n xe_devm_add+0x8b/0x100 [xe]\n xe_tile_init_noalloc+0x6a/0x70 [xe]\n xe_device_probe+0x48c/0x740 [xe]\n [... snip ...]"
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