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fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame() ni_read_frame() decompresses an LZNT $DATA frame into the vmapped target pages and then trusts decompress_lznt()'s return value: unc_size = decompress_lznt(frame_ondisk, ondisk_size, frame_mem, frame_size); if ((ssize_t)unc_size < 0) err = unc_size; else if (!unc_size || unc_size > frame_size) err = -EINVAL; decompress_lznt() stops as soon as the compressed stream is exhausted (e.g. a zero chunk header) and returns the number of bytes it actually wrote, which may be far less than frame_size. The bytes between unc_size and frame_size are never written. The only memset() that follows zeroes the region beyond i_valid; when the frame lies entirely within the file's valid size that memset() does not run, so the gap retains whatever was in the just-vmapped pages. All pages are then marked uptodate and returned to userspace, disclosing uninitialized (recently-freed) kernel page memory. A crafted compressed file whose stream decompresses to only a few bytes leaks the remainder of every frame on a plain read(2), which is enough to recover kernel pointers and defeat KASLR. Zero the [unc_size, frame_size) tail immediately after a successful LZNT decompress so the remainder reads back as zero.

Announced Source revision 1
Original source ↗

CVE-2026-89616

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-2026-89616

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": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "7d60a4c49af4d5cb88aa7cbf998d0408bd415055",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "cd40eee4923d104ebec9ac7513b971bc441e431d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "77d8efd04745cda23858546afdbd9d07b591758e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "376ee45659a4b943df672ad275c63da00655f929",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "4a1b39b2e10eb8de86265e80cf2be4396bc1dce4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4342306f0f0d5ff4315a204d315c1b51b914fca5",
        "lessThan": "35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ntfs3/frecord.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": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ntfs3/frecord.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89616

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35123 · Revision 1
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Publisher date
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