{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-64130",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64130",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T15:40:26.108Z",
    "updatedAt": "2026-07-19T15:40:26.108Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "mm/page_alloc: fix initialization of tags of the huge zero folio with init_on_free",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: fix initialization of tags of the huge zero folio with init_on_free\n\n__GFP_ZEROTAGS semantics are currently a bit weird, but effectively this\nflag is only ever set alongside __GFP_ZERO and __GFP_SKIP_KASAN.\n\nIf we run with init_on_free, we will zero out pages during\n__free_pages_prepare(), to skip zeroing on the allocation path.\n\nHowever, when allocating with __GFP_ZEROTAG set, post_alloc_hook() will\nconsequently not only skip clearing page content, but also skip clearing\ntag memory.\n\nNot clearing tags through __GFP_ZEROTAGS is irrelevant for most pages that\nwill get mapped to user space through set_pte_at() later: set_pte_at() and\nfriends will detect that the tags have not been initialized yet\n(PG_mte_tagged not set), and initialize them.\n\nHowever, for the huge zero folio, which will be mapped through a PMD\nmarked as special, this initialization will not be performed, ending up\nexposing whatever tags were still set for the pages.\n\nThe docs (Documentation/arch/arm64/memory-tagging-extension.rst) state\nthat allocation tags are set to 0 when a page is first mapped to user\nspace.  That no longer holds with the huge zero folio when init_on_free is\nenabled.\n\nFix it by decoupling __GFP_ZEROTAGS from __GFP_ZERO, passing to\ntag_clear_highpages() whether we want to also clear page content.\n\nInvert the meaning of the tag_clear_highpages() return value to have\nclearer semantics.\n\nReproduced with the huge zero folio by modifying the check_buffer_fill\narm64/mte selftest to use a 2 MiB area, after making sure that pages have\na non-0 tag set when freeing (note that, during boot, we will not actually\ninitialize tags, but only set KASAN_TAG_KERNEL in the page flags).\n\n\t$ ./check_buffer_fill\n\t1..20\n\t...\n\tnot ok 17 Check initial tags with private mapping, sync error mode and mmap memory\n\tnot ok 18 Check initial tags with private mapping, sync error mode and mmap/mprotect memory\n\t...\n\nThis code needs more cleanups; we'll tackle that next, like\ndecoupling __GFP_ZEROTAGS from __GFP_SKIP_KASAN.\n\n[akpm@linux-foundation.org: s/__GPF_ZERO/__GFP_ZERO/, per David]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "adfb6609c6809e107ded9a1cd46f519c882e64ea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "738d18f1da3513d17b6f7bf30146cc4ac2480ffd"
            },
            {
              "version": "adfb6609c6809e107ded9a1cd46f519c882e64ea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2f2aec5120b93a8f8b52dc50cdc60dbb8aec72f6"
            },
            {
              "version": "adfb6609c6809e107ded9a1cd46f519c882e64ea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6a288a4ddb4a994490505ab5f41c445f8e6b6467"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.18"
            },
            {
              "version": "6.18.34",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}