{"id":"CVE-2026-89781","published":"2026-09-16T09:17:08.667","lastModified":"2026-09-16T15:18:07.470","description":"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 >]","cvssScore":8.4,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/1b2d31f1083beb80c55d1152249f652c1445a559","tags":[]},{"url":"https://git.kernel.org/stable/c/49f7cbc902b08b56eb7d2633163ecc57a0e7145a","tags":[]},{"url":"https://git.kernel.org/stable/c/53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531","tags":[]},{"url":"https://git.kernel.org/stable/c/700973cc65db405bde0368ccf88699390150943e","tags":[]},{"url":"https://git.kernel.org/stable/c/74a83aa05f73033af719771ab1f0c269928b4865","tags":[]},{"url":"https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636","tags":[]},{"url":"https://git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The flaw is an out-of-bounds read vulnerability in the Linux kernel's NTFS3 file system driver, which can lead to memory corruption and potential privilege escalation if exploited.","exploitability":"Exploitation requires mounting a crafted NTFS image, making it moderately difficult. Precondition is the availability of a vulnerable Linux kernel version and an attacker with the ability to mount a custom file system.","blast_radius":"If exploited, the vulnerability could allow an attacker to read sensitive kernel memory, potentially leading to privilege escalation or other severe consequences.","remediation":"Upgrade to Linux kernel version 6.1.13 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["memory-corruption","privilege-escalation","file-system","linux-kernel"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-02T08:50:30.315Z"}}