CVE-2026-98729 (GCVE-0-2026-98729)
Vulnerability from cvelistv5
Published
2026-10-18 15:47
Modified
2026-10-19 09:24
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h get_align_mask() returns huge_page_mask_align() for hugetlbfs, but get_align_bits() adds va_align.bits regardless, so vm_unmapped_area() returns an address off the huge page boundary and __unmap_hugepage_range() hits BUG_ON(start & ~huge_page_mask(h)) at teardown. This can be triggered on Carrizo and FX-8370E, both hstates. Pass the file to get_align_bits() and skip the randomisation for hugetlbfs. [ bp: Massage commit message. ]
Impacted products
Vendor Product Version
Linux Linux Version: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0
Version: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0
Version: 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0
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{
  "containers": {
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/sys_x86_64.c"
          ],
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          "versions": [
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.13"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Don\u0027t apply va_align to hugetlb mappings on AMD F15h\n\nget_align_mask() returns huge_page_mask_align() for hugetlbfs, but get_align_bits()\nadds va_align.bits regardless, so vm_unmapped_area() returns an address off the huge\npage boundary and __unmap_hugepage_range() hits BUG_ON(start \u0026 ~huge_page_mask(h)) at\nteardown.\n\nThis can be triggered on Carrizo and FX-8370E, both hstates.\n\nPass the file to get_align_bits() and skip the randomisation for hugetlbfs.\n\n  [ bp: Massage commit message. ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:24:39.819Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/fe23680e6f1d52b8cc45d77bf7c54249508a81c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/b46b2e2de47ca9449532b0a7110ed99f79061d6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2457a7e2727dc747a61a50d65c2f259afce8c45"
        }
      ],
      "title": "x86/mm: Don\u0027t apply va_align to hugetlb mappings on AMD F15h",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98729",
    "datePublished": "2026-10-18T15:47:06.633Z",
    "dateReserved": "2026-09-25T10:25:14.366Z",
    "dateUpdated": "2026-10-19T09:24:39.819Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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