{"id":"CVE-2026-90048","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()\n\nni_create_attr_list() allocates a fixed buffer of al_aligned(record_size)\n(== record_size) bytes and th…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()\n\nni_create_attr_list() allocates a fixed buffer of al_aligned(record_size)\n(== record_size) bytes and th…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd","Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < fa2215cf451414b0512cd6f7d37a057893811f4d","Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < d07e281f2a7710502985d6f80b95ddac8f4e81d5","Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < a84f3db72561c4d9281c5ff721ce46b9ffa7f30e","Linux >= 4342306f0f0d5ff4315a204d315c1b51b914fca5 < 7c4841e2a62794a3bab7c1ff0540580f387e377f","Linux 5.15"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:27.570","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90048","references":[{"url":"https://git.kernel.org/stable/c/7c4841e2a62794a3bab7c1ff0540580f387e377f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a84f3db72561c4d9281c5ff721ce46b9ffa7f30e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d07e281f2a7710502985d6f80b95ddac8f4e81d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fa2215cf451414b0512cd6f7d37a057893811f4d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.928Z","epss":0.00509,"epssPercentile":0.42433,"slug":"CVE-2026-90048","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()\n\nni_create_attr_list() allocates a fixed buffer of al_aligned(record_size)\n(== record_size) bytes and then walks every attribute of the primary MFT\nrecord, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor\nby le_size(name_len), with no check against the end of the buffer; the\ntotal size is only computed after the loop.\n\nA minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24)\nbytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32)\nbytes in the list.  Because the number of attributes in a record is not\nbounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless\nminimum-size attributes), a crafted record packed with such attributes\nproduces a list larger than record_size and overflows the heap buffer.\n\nThis is reachable from a crafted, loop-mounted NTFS image: opening the file\nand adding an attribute (e.g. via setxattr) drives ntfs_set_ea() ->\nni_insert_resident() -> ni_insert_attr() -> ni_ins_attr_ext() ->\nni_create_attr_list().\n\n  BUG: KASAN: slab-out-of-bounds in ni_create_attr_list+0xc48/0x1058\n  Write of size 4 at addr ffff000008984c00 by task setfattr/345\n   ni_create_attr_list+0xc48/0x1058\n   ni_ins_attr_ext+0x510/0x7c0\n   ni_insert_attr+0x3f8/0x70c\n   ni_insert_resident+0xc8/0x3b0\n   ntfs_set_ea+0x66c/0xd28\n   ntfs_setxattr+0x4d8/0x5b0\n   __arm64_sys_setxattr+0xa4/0x124\n  Allocated by task 345:\n   ni_create_attr_list+0x188/0x1058\n  The buggy address belongs to the cache kmalloc-1k of size 1024\n  (the write lands at object+1024).\n\nSize the buffer from the actual attributes instead of assuming a single\nrecord_size is always enough.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204976,"id":"CVE-2026-90048","ts":1789570700730,"field":"cvss","old":null,"new":"9.8"},{"seq":204975,"id":"CVE-2026-90048","ts":1789570700730,"field":"severity","old":"none","new":"critical"}]}