CVE-2026-89781

CVE CVE-2026-89781EUVD EUVD-2026-80302Published 2026-09-16T08:48:20.000ZLast changed 2026-09-16T14:38:32.000ZCVSS 8.4

What the advisory describes

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 >]

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.18.52; patch: 6.6.157; patch: 5.15.221; b46acd6a6a627d876898e1c84d3f84902264b445 <49f7cbc902b08b56eb7d2633163ecc57a0e7145a; patch: 7.2.6; b46acd6a6a627d876898e1c84d3f84902264b445 <53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531; b46acd6a6a627d876898e1c84d3f84902264b445 <74a83aa05f73033af719771ab1f0c269928b4865; patch: 6.1.188; b46acd6a6a627d876898e1c84d3f84902264b445 <df099bfdb57773ba7f40f8a9dcc82e75af277922; b46acd6a6a627d876898e1c84d3f84902264b445 <de603b9d377fab57a5e6432fa84a9f36b32c1636; patch: 6.12.110; patch: 7.3-rc1; patch: 0; b46acd6a6a627d876898e1c84d3f84902264b445 <700973cc65db405bde0368ccf88699390150943e; b46acd6a6a627d876898e1c84d3f84902264b445 <1b2d31f1083beb80c55d1152249f652c1445a559; 5.15

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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