{
  "cveId": "CVE-2026-89781",
  "url": "https://patchblox.com/security/cve/CVE-2026-89781",
  "summary": "CVE-2026-89781 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-89781, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()",
  "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  \tu32 off = lsn_to_page_off(log, lsn) \u002B log-\u003Erecord_header_len;  log-\u003Erecord_header_len (and log-\u003Edata_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-\u003Epage_size. \u0022tail = log-\u003Epage_size - off\u0022 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\u002B0x216/0x580  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 \u003E= sign with \u003E]",
  "published": "2026-09-16T09:17:08Z",
  "severity": "Important",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00185,
  "epssPercentile": 0.08143,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89781",
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  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}