{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b46acd6a6a627d876898e1c84d3f84902264b445"
            },
            {
              "fixed": "ca343a99806b4fc8e27c48f08be3445c5fcd1445"
            },
            {
              "fixed": "ddfc8683e1a627dbf1b83bacf8961443dd654258"
            },
            {
              "fixed": "57c071e2c4f30b9c6f5aacb6679aab1269fbae99"
            },
            {
              "fixed": "159f694d682e4215b3822ae31ed3a4631628fe55"
            },
            {
              "fixed": "7adb38279812c9c06b0e3fa7382f4d7887f3fa2d"
            },
            {
              "fixed": "32b9f8733feb241627fa5f564b1a99b5cae974c5"
            },
            {
              "fixed": "6a4c53a2e26a865565bd6a460961e8d6fcb32329"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64533.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate lcns_follow in log_replay conversion\n\nlog_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY\nrecords when replaying version 0 restart tables.\n\nDuring this conversion, the memmove() length is derived directly from\nthe on-disk lcns_follow field:\n\n\tmemmove(\u0026dp-\u003evcn, \u0026dp0-\u003evcn_low,\n\t\t2 * sizeof(u64) +\n\t\t\t\tle32_to_cpu(dp-\u003elcns_follow) * sizeof(u64));\n\ncheck_rstbl() validates restart table structure, but does not constrain\nper-entry lcns_follow values relative to the entry size. A malformed\nfilesystem image can provide an oversized lcns_follow value, causing\nthe conversion memmove() to access memory beyond the bounds of the\nallocated restart table buffer.\n\nThe same field is later used to bound iteration over page_lcns[],\nso validating lcns_follow during conversion also prevents downstream\nout-of-bounds access from the same malformed metadata.\n\nCompute the maximum valid lcns_follow from the already-validated\nrestart table entry size and reject entries that exceed this bound.\nReuse the existing t16/t32 scratch variables already declared in\nlog_replay() to avoid introducing new declarations.\n\n[almaz.alexandrovich@paragon-software.com: fixed the conflicts]",
  "id": "CVE-2026-64533",
  "modified": "2026-07-29T03:30:11.756533188Z",
  "published": "2026-07-27T06:32:33.740Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/159f694d682e4215b3822ae31ed3a4631628fe55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32b9f8733feb241627fa5f564b1a99b5cae974c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57c071e2c4f30b9c6f5aacb6679aab1269fbae99"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a4c53a2e26a865565bd6a460961e8d6fcb32329"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7adb38279812c9c06b0e3fa7382f4d7887f3fa2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca343a99806b4fc8e27c48f08be3445c5fcd1445"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddfc8683e1a627dbf1b83bacf8961443dd654258"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64533.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64533"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "fs/ntfs3: validate lcns_follow in log_replay conversion"
}