CVE-2026-89616
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
In the Linux kernel, ni_read_frame() in fs/ntfs3 trusts decompress_lznt()'s return value, which may be smaller than the frame size. Unwritten bytes remain in the vmapped pages and are returned to userspace, disclosing uninitialized kernel memory.
Risk Assessment
An attacker can read uninitialized kernel memory (including kernel pointers), bypassing KASLR and facilitating further attacks.
Recommendation
Update the Linux kernel to a version containing the fix that zeroes the [unc_size, frame_size) tail after a successful LZNT decompress.
Other vulnerabilities in Linux kernel (fs/ntfs3)
See all- CVE-2026-89779Critical
In the Linux kernel, fs/ntfs3's ntfs_read_ea() does not verify that the EA record's ef->size is large enough to hold the record's name and value. A crafted NTFS image can set a small ef->size with a large elength, causing an out-of-bounds read past the allocated buffer and leaking kernel heap memory to userspace via getxattr().
- CVE-2026-97438High
A vulnerability was found in the Linux kernel's fs/ntfs3 module due to missing validation of index entry key bounds. A malformed NTFS directory index entry can advertise a key_size larger than the bytes actually present in its payload, causing an out-of-bounds read in cmp_fnames().
- CVE-2026-90200Low risk· EPSS 12%
In the Linux kernel, the ntfs_init_from_boot() function in the fs/ntfs3 driver has an integer overflow when validating MFT cluster numbers from the boot sector. The multiplication mlcn * sct_per_clst is performed in u64 and can wrap for large mlcn values, bypassing the volume size check and accepting a malformed record. In practice this causes NTFS mounts to fail in odd places.
- CVE-2026-89782High
A vulnerability was found in the Linux kernel's fs/ntfs3 module due to missing validation of restart table growth during $LogFile replay. When mounting a crafted NTFS image, an entry count exceeding U16_MAX is truncated, causing allocation of a table smaller than required and an out-of-bounds access.
- CVE-2026-89617High
In the Linux kernel, the fs/ntfs3 driver does not validate the dirty page table during log replay. A crafted DIR_PAGE_ENTRY with an invalid lcns_follow field lets the v0->v1 conversion and later replay passes run off the entry.
- CVE-2026-89615High
In the Linux kernel, the copy_lcns and redo shorten loops in fs/ntfs3 index page_lcns[] based on the log record's lcns_follow, which is not checked against the target entry. A crafted record can overflow page_lcns[] of an otherwise valid entry.
- CVE-2026-45864Medium
In the Linux kernel's NTFS3 filesystem, an infinite loop vulnerability was found when processing the range [valid : pos). If the valid value cannot be read correctly and remains the same, a process hang may occur, as reported by syzbot. A check was added to detect unchanged valid values and return -EINVAL.
- CVE-2025-71311High
In the Linux kernel, the NTFS3 filesystem has a vulnerability involving the use of uninitialized folios. Newly allocated folios are not marked as uptodate, and the ni_read_frame() function is skipped when the caller expects the frame to be completely overwritten, leaving part of the memory uninitialized.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS