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vuln-cve/data/2025/39xxx/CVE-2025-39845.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-39845",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.141Z",
"datePublished": "2025-09-19T15:26:19.225Z",
"dateUpdated": "2026-11-10T12:37:10.791Z"
},
"containers": {
"cna": {
"providerMetadata": {
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"shortName": "Linux",
"dateUpdated": "2026-05-11T21:37:33.382Z"
},
"descriptions": [
{
"lang": "en",
"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 <TASK>\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 </TASK>\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 <TASK>\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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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"arch/x86/mm/init_64.c"
],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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"arch/x86/mm/init_64.c"
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"versions": [
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"status": "affected"
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"version": "6.17",
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"cpeApplicability": [
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"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"url": "https://git.kernel.org/stable/c/6659d027998083fbb6d42a165b0c90dc2e8ba989"
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"title": "x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()",
"x_generator": {
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"adp": [
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"references": [
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"providerMetadata": {
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"shortName": "CVE",
"dateUpdated": "2025-11-03T17:44:00.910Z"
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