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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89616
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:46 UTC
Updated2026-09-11 20:19:46 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea git Not specified
CNA Linux Linux affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 376ee45659a4b943df672ad275c63da00655f929 git Not specified
CNA Linux Linux affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 4a1b39b2e10eb8de86265e80cf2be4396bc1dce4 git Not specified
CNA Linux Linux affected 4342306f0f0d5ff4315a204d315c1b51b914fca5 35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/35d1ea92c7d946e2ebdbe36cdb2c969c8704bebd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f699ddb290a24b37e1bc9bf1e3c9dbccf564bea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a1b39b2e10eb8de86265e80cf2be4396bc1dce4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/376ee45659a4b943df672ad275c63da00655f929 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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