{"id":"CVE-2026-89779","published":"2026-09-16T09:17:08.387","lastModified":"2026-09-16T15:18:07.320","description":"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.","cvssScore":9.1,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699","tags":[]},{"url":"https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc","tags":[]},{"url":"https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44","tags":[]},{"url":"https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818","tags":[]},{"url":"https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c","tags":[]},{"url":"https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146","tags":[]},{"url":"https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The flaw allows an attacker to read out-of-bounds heap memory via a crafted EA record, leading to potential heap memory leaks to userspace.","exploitability":"Exploitation requires a crafted EA record with specific size and length values, making it moderately difficult. Precondition is the presence of an NTFS filesystem with vulnerable EA records.","blast_radius":"If exploited, the vulnerability could lead to information leakage, potentially compromising sensitive data stored in the filesystem.","remediation":"Upgrade to the Linux kernel version 6.1.13 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["heap-overflow","memory-leak","ntfs","xattr"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-29T09:08:58.470Z"}}