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CVE-2025-39845 (GCVE-0-2025-39845)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-09-08 08:42
VLAI
Title
x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() Define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to ensure page tables are properly synchronized when calling p*d_populate_kernel(). For 5-level paging, synchronization is performed via pgd_populate_kernel(). In 4-level paging, pgd_populate() is a no-op, so synchronization is instead performed at the P4D level via p4d_populate_kernel(). This fixes intermittent boot failures on systems using 4-level paging and a large amount of persistent memory: BUG: unable to handle page fault for address: ffffe70000000034 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI RIP: 0010:__init_single_page+0x9/0x6d Call Trace: <TASK> __init_zone_device_page+0x17/0x5d memmap_init_zone_device+0x154/0x1bb pagemap_range+0x2e0/0x40f memremap_pages+0x10b/0x2f0 devm_memremap_pages+0x1e/0x60 dev_dax_probe+0xce/0x2ec [device_dax] dax_bus_probe+0x6d/0xc9 [... snip ...] </TASK> It also fixes a crash in vmemmap_set_pmd() caused by accessing vmemmap before sync_global_pgds() [1]: BUG: unable to handle page fault for address: ffffeb3ff1200000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI Tainted: [W]=WARN RIP: 0010:vmemmap_set_pmd+0xff/0x230 <TASK> vmemmap_populate_hugepages+0x176/0x180 vmemmap_populate+0x34/0x80 __populate_section_memmap+0x41/0x90 sparse_add_section+0x121/0x3e0 __add_pages+0xba/0x150 add_pages+0x1d/0x70 memremap_pages+0x3dc/0x810 devm_memremap_pages+0x1c/0x60 xe_devm_add+0x8b/0x100 [xe] xe_tile_init_noalloc+0x6a/0x70 [xe] xe_device_probe+0x48c/0x740 [xe] [... snip ...]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8d400913c231bd1da74067255816453f96cd35b0 , < 744ff519c72de31344a627eaf9b24e9595aae554 (git)
Affected: 8d400913c231bd1da74067255816453f96cd35b0 , < 5f761d40ee95d2624f839c90ebeef2d5c55007f5 (git)
Affected: 8d400913c231bd1da74067255816453f96cd35b0 , < 26ff568f390a531d1bd792e49f1a401849921960 (git)
Affected: 8d400913c231bd1da74067255816453f96cd35b0 , < b7f4051dd3388edd30e9a6077c05c486aa31e0d4 (git)
Affected: 8d400913c231bd1da74067255816453f96cd35b0 , < 6bf9473727569e8283c1e2445c7ac42cf4fc9fa9 (git)
Affected: 8d400913c231bd1da74067255816453f96cd35b0 , < 6659d027998083fbb6d42a165b0c90dc2e8ba989 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.192 , ≤ 5.15.* (semver)
Unaffected: 6.1.151 , ≤ 6.1.* (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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      "cve": "CVE-2025-39845",
      "date": "2026-09-16",
      "epss": "0.0015",
      "percentile": "0.04547"
    },
    "microsoft_vex": {
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      "cve": "CVE-2025-39845",
      "id": "msrc_CVE-2025-39845",
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      "product_status:fixed": "2",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39845.json",
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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   \u003cTASK\u003e\\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   \u003c/TASK\u003e\\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   \u003cTASK\u003e\\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 ...]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/x86/include/asm/pgtable_64_types.h\",\"arch/x86/mm/init_64.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8d400913c231bd1da74067255816453f96cd35b0\",\"lessThan\":\"744ff519c72de31344a627eaf9b24e9595aae554\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8d400913c231bd1da74067255816453f96cd35b0\",\"lessThan\":\"5f761d40ee95d2624f839c90ebeef2d5c55007f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8d400913c231bd1da74067255816453f96cd35b0\",\"lessThan\":\"26ff568f390a531d1bd792e49f1a401849921960\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8d400913c231bd1da74067255816453f96cd35b0\",\"lessThan\":\"b7f4051dd3388edd30e9a6077c05c486aa31e0d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8d400913c231bd1da74067255816453f96cd35b0\",\"lessThan\":\"6bf9473727569e8283c1e2445c7ac42cf4fc9fa9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8d400913c231bd1da74067255816453f96cd35b0\",\"lessThan\":\"6659d027998083fbb6d42a165b0c90dc2e8ba989\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/x86/include/asm/pgtable_64_types.h\",\"arch/x86/mm/init_64.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.192\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.151\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.105\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.46\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.6\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC CN 4100\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V5.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.13\",\"versionEndExcluding\":\"5.15.192\",\"matchCriteriaId\":\"58184035-CB3D-4BC2-B2F2-3ECF469A82CE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.151\",\"matchCriteriaId\":\"BC2D0B88-F133-4143-B91D-0A439AA143C0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.105\",\"matchCriteriaId\":\"B9364B0C-6B18-422E-8254-73EF0E856875\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.46\",\"matchCriteriaId\":\"F7E2B332-E920-4CAC-B400-288602DB6F16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.6\",\"matchCriteriaId\":\"548F104C-0F08-438B-9C97-64C903F0C678\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"327D22EF-390B-454C-BD31-2ED23C998A1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C730CD9A-D969-4A8E-9522-162AAF7C0EE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"39982C4B-716E-4B2F-8196-FA301F47807D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"340BEEA9-D70D-4290-B502-FBB1032353B1\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:21:54+00:00",
      "cve": "CVE-2025-39845",
      "id": "CVE-2025-39845",
      "initial_release_date": "2025-09-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39845.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:57:35Z",
      "cve": "CVE-2025-39845",
      "id": "CVE-2025-39845",
      "initial_release_date": "2025-09-19T23:24:00Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "387",
      "product_status:recommended": "464",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39845",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39845.json",
      "version": "50"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.