{"id":"CVE-2026-89779","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89779","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate ef->size covers the record's name and value\n\nWhen an EA record has a non-zero ef->size, ntfs_read_ea()…","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate ef->size covers the record's name and value\n\nWhen an EA record has a non-zero ef->size, ntfs_read_ea() only checks\nthat the record fits in the remaining buffer (ea_size > bytes), not that\nef->size is large enough to hold the record's own name_len + 1 + elength.\n\nA crafted image can pass validation with, e.g., ef->size = 24 but\nelength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of\nthe undersized record, reading past the kmalloc(info->size) allocation\nand leaking heap memory to userspace via getxattr():\n\n BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)\n Read of size 65535 at addr ffff888100794550 by task exploit\n  __asan_memcpy (mm/kasan/shadow.c:105)\n  ntfs_get_ea (fs/ntfs3/xattr.c:302)\n  ntfs_getxattr (fs/ntfs3/xattr.c:848)\n  __vfs_getxattr (fs/xattr.c:441)\n  vfs_getxattr (fs/xattr.c:474)\n  do_getxattr (fs/xattr.c:800)\n  path_getxattrat (fs/xattr.c:868)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n\n The buggy address is located 80 bytes inside of\n  allocated 84-byte region in cache kmalloc-96\n\nCompute the size the record needs and require ef->size to cover it.","published":"2026-09-16T08:48:19.083Z","modified":"2026-09-16T08:48:19.083Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818"},{"type":"WEB","url":"https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T08:48:19.083Z"}}