CVE-2026-98373 (GCVE-0-2026-98373)
Vulnerability from cvelistv5
Published
2026-10-07 13:01
Modified
2026-10-21 12:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: preserve mremap address delta when skipping page tables move_hugetlb_page_tables() optimizes mremap() by advancing to the last entry in the page table when the source page table does not exist, either initially or after unsharing a PMD table. The common loop increment then steps to the first entry in the next page table. However, the code advances both the source and destination addresses to the last entries in their respective page tables, which is wrong. The destination address must be advanced only by the same amount as the source address. If the source and destination offsets within their page tables differ, the destination address can be advanced too far, causing follow-up issues. Fix this by advancing the destination address by the source advance distance. With a reproducer, we were able to trigger a kernel panic on x86-64. With this fix in place, we can no longer reproduce the issue.
References
Impacted products
Vendor Product Version
Linux Linux Version: e95a9851787bbb3cd4deb40fe8bab03f731852d1
Version: e95a9851787bbb3cd4deb40fe8bab03f731852d1
Version: e95a9851787bbb3cd4deb40fe8bab03f731852d1
Version: e95a9851787bbb3cd4deb40fe8bab03f731852d1
Version: e95a9851787bbb3cd4deb40fe8bab03f731852d1
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{
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: preserve mremap address delta when skipping page tables\n\nmove_hugetlb_page_tables() optimizes mremap() by advancing to the last\nentry in the page table when the source page table does not exist, either\ninitially or after unsharing a PMD table.  The common loop increment then\nsteps to the first entry in the next page table.\n\nHowever, the code advances both the source and destination addresses to\nthe last entries in their respective page tables, which is wrong.  The\ndestination address must be advanced only by the same amount as the source\naddress.\n\nIf the source and destination offsets within their page tables differ, the\ndestination address can be advanced too far, causing follow-up issues. \nFix this by advancing the destination address by the source advance\ndistance.\n\nWith a reproducer, we were able to trigger a kernel panic on x86-64.  With\nthis fix in place, we can no longer reproduce the issue."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:54:58.154Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/cf73ef2a761df9329af116c905a7a94b317921e4"
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        },
        {
          "url": "https://git.kernel.org/stable/c/9bdad082d44bdcf93716973dcba6be77e8a06e7b"
        }
      ],
      "title": "mm/hugetlb: preserve mremap address delta when skipping page tables",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98373",
    "datePublished": "2026-10-07T13:01:47.433Z",
    "dateReserved": "2026-09-25T10:25:14.345Z",
    "dateUpdated": "2026-10-21T12:54:58.154Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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