CVE-2026-89616fs/ntfs3: fix info-leak on partial LZNT decompress in ni_read_frame()
- 7.5HighCVSS base score
- 0.41%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.41% · top 64% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < 7d60a4c49af4d5cb88aa7cbf998d0408bd415055
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < cd40eee4923d104ebec9ac7513b971bc441e431d
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < 77d8efd04745cda23858546afdbd9d07b591758e
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < 0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < 376ee45659a4b943df672ad275c63da00655f929
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < 4a1b39b2e10eb8de86265e80cf2be4396bc1dce4
- affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 – < 35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References7
- https://git.kernel.org/stable/c/7d60a4c49af4d5cb88aa7cbf998d0408bd415055 (opens in a new tab)
- https://git.kernel.org/stable/c/cd40eee4923d104ebec9ac7513b971bc441e431d (opens in a new tab)
- https://git.kernel.org/stable/c/77d8efd04745cda23858546afdbd9d07b591758e (opens in a new tab)
- https://git.kernel.org/stable/c/0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea (opens in a new tab)
- https://git.kernel.org/stable/c/376ee45659a4b943df672ad275c63da00655f929 (opens in a new tab)
- https://git.kernel.org/stable/c/4a1b39b2e10eb8de86265e80cf2be4396bc1dce4 (opens in a new tab)
- https://git.kernel.org/stable/c/35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76528 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89616)Record last updated .