{
  "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-2026-63875",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-63875",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T14:54:48.842Z",
    "updatedAt": "2026-10-19T20:17:53.723Z",
    "importedAt": "2026-10-24T01:58:20.586Z",
    "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": "arm64: tlb: Flush walk cache when unsharing PMD tables",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: tlb: Flush walk cache when unsharing PMD tables\n\nWhen huge_pmd_unshare() is called to unshare a PMD table, the\ntlb_unshare_pmd_ptdesc() function sets tlb->unshared_tables=true\nbut the aarch64 tlb_flush() only checked tlb->freed_tables to\ndetermine whether to use TLBF_NONE (vae1is, invalidates walk\ncache) or TLBF_NOWALKCACHE (vale1is, leaf-only).\n\nThis caused the stale PMD page table entry to remain in the walk cache\nafter unshare, potentially leading to incorrect page table walks.\n\nFix by including unshared_tables in the check, so that when\nunsharing tables, TLBF_NONE is used and the walk cache is properly\ninvalidated.\n\nHere is the detailed distinction between vae1is and vale1is:\n\n| Instruction Combination  | Actual Invalidation Scope                         |\n| ------------------------ | --------------------------------------------------|\n| `VAE1IS`  + TTL=`0`      | All entries at all levels (full invalidation)     |\n| `VAE1IS`  + TTL=`2` (L2) | Non-leaf at Level 0/1 + leaf at Level 2           |\n| `VALE1IS` + TTL=`0`      | Leaf entries at all levels (non-leaf not cleared) |\n| `VALE1IS` + TTL=`2` (L2) | Leaf entry at Level 2 only                        |",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "6495204f8219a57859669d618b25d06176d5a872",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dced308d7d6a0de1c09d2058f38f1aaaf5cbb914"
            },
            {
              "version": "ce4cf24761467756462c0e1dbe4a5e9c9eb520fc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "47490bbb05c8c0e09cc3cfd237d8934ffc340583"
            },
            {
              "version": "daa6707b71a2da23a82979fa21f788aeb706f1a2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0199c9d57861f17b556b6cba1f765c7cce79745b"
            },
            {
              "version": "ff37dd18ce7739a26aab0cc2d31006a45e6bde63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d766a49d9b55705c4737cd8bb5d3faa2d31330fd"
            },
            {
              "version": "da06bb0ca45b1ca6f1ab55023e34e61a520337f3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8ca7284da0e67b3e71d90ec17f08286774245ad9"
            },
            {
              "version": "9b671f6f432be07c0ddd66e437d6d0e0db684f83",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fe93e907b1af03cc229a80aa64a570a103d2b279"
            },
            {
              "version": "8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "48125cd9c55cbe297b59fd1f9bda48b0960bd181"
            },
            {
              "version": "8ce720d5bd91e9dc16db3604aa4b1bf76770a9a1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c2ff4764e03e7a8d758352f4aceb8fe1be6ac971"
            },
            {
              "version": "5.10.253",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.259"
            },
            {
              "version": "5.15.203",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.210"
            },
            {
              "version": "6.1.167",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.176"
            },
            {
              "version": "6.6.127",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.6.143"
            },
            {
              "version": "6.12.74",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.12.93"
            },
            {
              "version": "6.18.13",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.18.35"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.19",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.19"
            },
            {
              "version": "5.10.259",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.210",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.176",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.143",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.93",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.35",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.12",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}