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CVE-2026-89616

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

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

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 7d60a4c49af4d5cb88aa7cbf998d0408bd415055; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in cd40eee4923d104ebec9ac7513b971bc441e431d; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 77d8efd04745cda23858546afdbd9d07b591758e; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 376ee45659a4b943df672ad275c63da00655f929; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 4a1b39b2e10eb8de86265e80cf2be4396bc1dce4; From 4342306f0f0d5ff4315a204d315c1b51b914fca5 · fixed in 35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 7

git.kernel.org