CVE-2026-45864

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().

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().

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.

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.

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.

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.

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.

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.