fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89781
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 09:17:08 UTC
Updated2026-09-16 15:18:07 UTC
DescriptionIn 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 >]

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 df099bfdb57773ba7f40f8a9dcc82e75af277922 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 1b2d31f1083beb80c55d1152249f652c1445a559 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 700973cc65db405bde0368ccf88699390150943e git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 49f7cbc902b08b56eb7d2633163ecc57a0e7145a git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 74a83aa05f73033af719771ab1f0c269928b4865 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 de603b9d377fab57a5e6432fa84a9f36b32c1636 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/49f7cbc902b08b56eb7d2633163ecc57a0e7145a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b2d31f1083beb80c55d1152249f652c1445a559 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/700973cc65db405bde0368ccf88699390150943e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74a83aa05f73033af719771ab1f0c269928b4865 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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