Skip to content
Heist/ feed
High

fs/ntfs3: validate lcns_follow in log_replay conversion

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate lcns_follow in log_replay conversion log_replay() converts DIR_PAGE_ENTRY_32 records into DIR_PAGE_ENTRY records when replaying version 0 restart tables. During this conversion, the memmove() length is derived directly from the on-disk lcns_follow field: memmove(&dp->vcn, &dp0->vcn_low, 2 * sizeof(u64) + le32_to_cpu(dp->lcns_follow) * sizeof(u64)); check_rstbl() validates restart table structure, but does not constrain per-entry lcns_follow values relative to the entry size. A malformed filesystem image can provide an oversized lcns_follow value, causing the conversion memmove() to access memory beyond the bounds of the allocated restart table buffer. The same field is later used to bound iteration over page_lcns[], so validating lcns_follow during conversion also prevents downstream out-of-bounds access from the same malformed metadata. Compute the maximum valid lcns_follow from the already-validated restart table entry size and reject entries that exceed this bound. Reuse the existing t16/t32 scratch variables already declared in log_replay() to avoid introducing new declarations. [almaz.alexandrovich@paragon-software.com: fixed the conflicts]

Announced Group revision 1
Original source ↗

CVE-2026-64533

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64533

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "ca343a99806b4fc8e27c48f08be3445c5fcd1445",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "ddfc8683e1a627dbf1b83bacf8961443dd654258",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "57c071e2c4f30b9c6f5aacb6679aab1269fbae99",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "159f694d682e4215b3822ae31ed3a4631628fe55",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "7adb38279812c9c06b0e3fa7382f4d7887f3fa2d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "32b9f8733feb241627fa5f564b1a99b5cae974c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
        "lessThan": "6a4c53a2e26a865565bd6a460961e8d6fcb32329",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ntfs3/fslog.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/fslog.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64533

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41069 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-64533 · Revision 1Source updated