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"affected", "version": "0", "lessThan": "V5.0", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}]}]}}

{}

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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 ...]"}], "id": "CVE-2025-39845", "lastModified": "2026-05-12T13:17:15.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-09-19T16:15:43.280", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/26ff568f390a531d1bd792e49f1a401849921960"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f761d40ee95d2624f839c90ebeef2d5c55007f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6659d027998083fbb6d42a165b0c90dc2e8ba989"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bf9473727569e8283c1e2445c7ac42cf4fc9fa9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/744ff519c72de31344a627eaf9b24e9595aae554"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7f4051dd3388edd30e9a6077c05c486aa31e0d4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()", "id": "2396917", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396917"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39845", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39845\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39845\nhttps://lore.kernel.org/linux-cve-announce/2025091903-CVE-2025-39845-a493@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-22T10:00:07.938508+00:00", "updated": "2025-09-22T10:06:27.714203+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}