CVE-2026-64295 mm: page_ext: add count limit to page_ext_iter_next to prevent invalid PFN access

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "include/linux/page_ext.h"
    ],
    "versions": [
      {
        "version": "9039b9096ea27a20f0349d1537537663c935c8ed",
        "lessThan": "8dcaa0f87a88d720d13106f3a306c6b61d189d86",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9039b9096ea27a20f0349d1537537663c935c8ed",
        "lessThan": "377b1cd6bbcf327338cd951cc2fd74bc75540235",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9039b9096ea27a20f0349d1537537663c935c8ed",
        "lessThan": "ffd017237cfe99e6e5602ab14179b0e6878a0840",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "include/linux/page_ext.h"
    ],
    "versions": [
      {
        "version": "6.15",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.15",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.39",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.4",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2-rc3",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]