CVE-2026-89781fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()
- 8.4HighCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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. [[email protected]: replaced the >= sign with >]
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 33 days later
· 33 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < df099bfdb57773ba7f40f8a9dcc82e75af277922
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 1b2d31f1083beb80c55d1152249f652c1445a559
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 700973cc65db405bde0368ccf88699390150943e
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 49f7cbc902b08b56eb7d2633163ecc57a0e7145a
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 74a83aa05f73033af719771ab1f0c269928b4865
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < 53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531
- affected b46acd6a6a627d876898e1c84d3f84902264b445 – < de603b9d377fab57a5e6432fa84a9f36b32c1636
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References7
- https://git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922 (opens in a new tab)
- https://git.kernel.org/stable/c/1b2d31f1083beb80c55d1152249f652c1445a559 (opens in a new tab)
- https://git.kernel.org/stable/c/700973cc65db405bde0368ccf88699390150943e (opens in a new tab)
- https://git.kernel.org/stable/c/49f7cbc902b08b56eb7d2633163ecc57a0e7145a (opens in a new tab)
- https://git.kernel.org/stable/c/74a83aa05f73033af719771ab1f0c269928b4865 (opens in a new tab)
- https://git.kernel.org/stable/c/53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531 (opens in a new tab)
- https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-80302 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89781)Record last updated .