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ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e() The bounds check in ntfs_dir_emit() compares fname->name_len (a character count) against e->size (a byte count) without accounting for the 2-byte-per-character UTF-16LE encoding or the ATTR_FILE_NAME header size: if (fname->name_len + sizeof(struct NTFS_DE) > le16_to_cpu(e->size)) This computes: name_len + 16 > e_size The correct check must account for the ATTR_FILE_NAME header (66 bytes before the name) and the UTF-16LE character size (2 bytes each): sizeof(NTFS_DE) + offsetof(ATTR_FILE_NAME, name) + name_len * sizeof(short) > e_size Which computes: 16 + 66 + name_len * 2 > e_size The correct calculation already exists as fname_full_size() in ntfs.h and is used in cmp_fnames(), namei.c, and fslog.c, but was not used in the readdir path. A crafted NTFS image with an index entry containing a small e->size but large fname->name_len bypasses the current check, causing ntfs_utf16_to_nls() to read past the entry boundary. Additionally, add a key_size validation in hdr_find_e() to ensure the declared key_size does not exceed the available entry data, preventing comparison functions from reading past entry boundaries on the lookup path.

Announced Source revision 1
Original source ↗

CVE-2026-97437

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-2026-97437

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "d1f98938e437732c0ecdfc8ee451e12a072f6d07",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "0505f1e7bb5b981b6ed62d98b26ddce76142865d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "2f7d0ec8c10dc7bf7a8c9a9cb169f9a4d1fac2ba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "ed6da1abeec50db9060d714f03743fe0b63e4fe4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "6a8149a20e46086c756c2a9202e377c0b649a0c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "aa1bdbb39f49c5bc9779316891c40005517842a5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ntfs3/dir.c",
      "fs/ntfs3/index.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": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/dir.c",
      "fs/ntfs3/index.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97437

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#8322 · Revision 1
Added to Heist Feed
Publisher date
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