{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64533",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64533"
  ],
  "published": "2026-07-27T06:32:40Z",
  "summary": "fs/ntfs3: validate lcns_follow in log_replay conversion",
  "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(&dp->vcn, &dp0->vcn_low,\n\t\t2 * sizeof(u64) +\n\t\t\t\tle32_to_cpu(dp->lcns_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]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.97"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64533"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ca343a99806b4fc8e27c48f08be3445c5fcd1445"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ddfc8683e1a627dbf1b83bacf8961443dd654258"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/57c071e2c4f30b9c6f5aacb6679aab1269fbae99"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/159f694d682e4215b3822ae31ed3a4631628fe55"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7adb38279812c9c06b0e3fa7382f4d7887f3fa2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/32b9f8733feb241627fa5f564b1a99b5cae974c5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6a4c53a2e26a865565bd6a460961e8d6fcb32329"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The NTFS3 parser consumes malicious metadata from a locally mounted block device or filesystem image, not directly through a network protocol.\nAC:L - A structurally valid 44-byte entry with attacker-controlled lcns_follow=2 already crosses the heap-buffer boundary. No race or uncontrollable condition is required.\nPR:N - The attacker needs no account or capability to prepare and supply the crafted image; the init-namespace CAP_SYS_ADMIN mount requirement applies to the interacting victim or privileged mounting helper.\nUI:R - A victim or trusted mounting helper must cause the crafted NTFS filesystem to be mounted before journal replay processes the malicious metadata.\nS:U - The corruption compromises the kernel processing its own filesystem metadata and does not cross a distinct security authority such as a guest-to-host boundary.\nC:H - The attacker-controlled memmove performs a heap out-of-bounds read of attacker-selected extent, and the resulting memory corruption can be leveraged to disclose kernel memory.\nI:H - The same memmove writes beyond the allocated restart-table buffer, allowing corruption of adjacent slab objects and potentially arbitrary writes or control-flow hijacking.\nA:H - A sufficiently large lcns_follow reliably drives the kernel into an extensive invalid memory access, causing an oops or panic during mount and permitting repeated denial of service."
    }
  }
}