CVE-2026-89781 is a vulnerability in Linux Kernel
Published on September 16, 2026
fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()
read_log_rec_buf() copies a log record into a caller buffer starting at
u32 off = lsn_to_page_off(log, lsn) + log->record_header_len;
log->record_header_len (and log->data_off, used for the following pages)
comes verbatim from the on-disk restart area and is only checked for
8-byte alignment in is_rst_area_valid(), so off can exceed
log->page_size. "tail = log->page_size - off" then underflows and
memcpy() reads past the page_size-sized buffer returned by
read_log_page(), spilling adjacent slab memory into the replay buffer.
This is reachable by mounting a crafted NTFS image:
BUG: KASAN: slab-out-of-bounds in read_log_rec_buf+0x216/0x580
Read of size 64 at addr ffff88800a877ff8 by task exploit/127
read_log_rec_buf fs/ntfs3/fslog.c:2299
log_replay fs/ntfs3/fslog.c:4216
ntfs_loadlog_and_replay fs/ntfs3/fsntfs.c:324
ntfs_fill_super fs/ntfs3/super.c:1392
get_tree_bdev_flags fs/super.c:1694
__x64_sys_mount fs/namespace.c:4360
The buggy address is located 4088 bytes to the right of
the 4096-byte region [ffff88800a876000, ffff88800a877000)
Reject an in-page offset outside the current page before the copy.
[almaz.alexandrovich@paragon-software.com: replaced the >= sign with >]
Products Associated with CVE-2026-89781
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Affected Versions
Linux:- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below df099bfdb57773ba7f40f8a9dcc82e75af277922 is affected.
- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below 1b2d31f1083beb80c55d1152249f652c1445a559 is affected.
- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below 700973cc65db405bde0368ccf88699390150943e is affected.
- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below 49f7cbc902b08b56eb7d2633163ecc57a0e7145a is affected.
- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below 74a83aa05f73033af719771ab1f0c269928b4865 is affected.
- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below 53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531 is affected.
- Version b46acd6a6a627d876898e1c84d3f84902264b445 and below de603b9d377fab57a5e6432fa84a9f36b32c1636 is affected.
- Version 5.15 is affected.
- Before 5.15 is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.6, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.