{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89781","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.765Z","datePublished":"2026-09-16T08:48:20.425Z","dateUpdated":"2026-09-16T14:38:32.420Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-16T14:38:32.420Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix out-of-bounds read in read_log_rec_buf()\n\nread_log_rec_buf() copies a log record into a caller buffer starting at\n\n\tu32 off = lsn_to_page_off(log, lsn) + log->record_header_len;\n\nlog->record_header_len (and log->data_off, used for the following pages)\ncomes verbatim from the on-disk restart area and is only checked for\n8-byte alignment in is_rst_area_valid(), so off can exceed\nlog->page_size. \"tail = log->page_size - off\" then underflows and\nmemcpy() reads past the page_size-sized buffer returned by\nread_log_page(), spilling adjacent slab memory into the replay buffer.\n\nThis is reachable by mounting a crafted NTFS image:\n\n BUG: KASAN: slab-out-of-bounds in read_log_rec_buf+0x216/0x580\n Read of size 64 at addr ffff88800a877ff8 by task exploit/127\n  read_log_rec_buf fs/ntfs3/fslog.c:2299\n  log_replay fs/ntfs3/fslog.c:4216\n  ntfs_loadlog_and_replay fs/ntfs3/fsntfs.c:324\n  ntfs_fill_super fs/ntfs3/super.c:1392\n  get_tree_bdev_flags fs/super.c:1694\n  __x64_sys_mount fs/namespace.c:4360\n The buggy address is located 4088 bytes to the right of\n the 4096-byte region [ffff88800a876000, ffff88800a877000)\n\nReject an in-page offset outside the current page before the copy.\n\n[almaz.alexandrovich@paragon-software.com: replaced the >= sign with >]"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The OOB read is reached only while mounting a local NTFS volume (path_mount→ntfs_fill_super→ntfs_loadlog_and_replay→log_replay→read_rst_area/find_log_rec→read_log_rec_buf). ksmbd/nfsd never parse $LogFile; journal replay runs at fill_super, not while serving exported files.\nAC:L - rec_hdr_len and data_off in the on-disk restart area are attacker-controlled and only checked for 8-byte alignment, so off=lsn_to_page_off()+record_header_len (and later data_off) can exceed page_size. The u32 tail underflow and memcpy past the kmalloc(page_size) log page are deterministic with no race.\nPR:N - No account or privilege on the victim is required: a crafted NTFS volume on USB/removable media, a disk image, or shared storage is sufficient for udisks2/systemd automount or an administrator mount to run $LogFile replay as root.\nUI:N - Desktop, kiosk, automotive, and shared-workstation automounters mount attacker-supplied NTFS media and run log_replay() inside ntfs_fill_super() without the user opening files or confirming a dialog; attaching the crafted volume is sufficient.\nS:U - The slab out-of-bounds read occurs in the host kernel during ntfs3 journal replay in the mounting process; impact stays within one kernel security authority and is not a VM escape or IOMMU/DMA bypass.\nC:H - memcpy() copies attacker-chosen client_data_len bytes from past the page_size log-page slab into the replay buffer, spilling adjacent heap. client_data_len is only bounded by kmalloc success on the restart-area path, so this is an unbounded heap OOB read (Confidentiality High), not a few-byte leak.\nI:H - With a valid rec_hdr_len and oversized data_off, multi-page log records keep an attacker-controlled LOG_REC_HDR then fill the rest from adjacent slab (including same-size log pages from the crafted image). do_action then memmove()s that buffer into kmalloc'd MFT and index objects, yielding kernel writes from attacker-influenced heap contents.\nA:H - An oversized rec_hdr_len or data_off plus a large client_data_len drives memcpy() far past the 4KiB log-page allocation into unmapped slab or guard pages, causing a kernel oops or panic on mount. The crash is repeatable on every mount of the crafted NTFS volume."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"],"versions":[{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"df099bfdb57773ba7f40f8a9dcc82e75af277922","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"1b2d31f1083beb80c55d1152249f652c1445a559","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"700973cc65db405bde0368ccf88699390150943e","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"49f7cbc902b08b56eb7d2633163ecc57a0e7145a","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"74a83aa05f73033af719771ab1f0c269928b4865","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"de603b9d377fab57a5e6432fa84a9f36b32c1636","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"],"versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"5.15.221","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.188","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922"},{"url":"https://git.kernel.org/stable/c/1b2d31f1083beb80c55d1152249f652c1445a559"},{"url":"https://git.kernel.org/stable/c/700973cc65db405bde0368ccf88699390150943e"},{"url":"https://git.kernel.org/stable/c/49f7cbc902b08b56eb7d2633163ecc57a0e7145a"},{"url":"https://git.kernel.org/stable/c/74a83aa05f73033af719771ab1f0c269928b4865"},{"url":"https://git.kernel.org/stable/c/53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531"},{"url":"https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636"}],"title":"fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()","x_generator":{"engine":"bippy-1.2.0"}}}}