{"id":"CVE-2026-89779","title":"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 remain…","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() only checks\nthat the record fits in the remain…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 333feb7ba84f69f9b423422417aaac54fd9e7c84 < b27e68ad818a4ca2cef8f35f97e75d756714c818","Linux >= 000a9a72efa4a9df289bab9c9e8ba1639c72e0d6 < 28a924c7e67e6d71abeb04860b61166fecb027fc","Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b < d585ed08308909c7e6fefb4e8a258aeb29b19ff9","Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b < 077df8464cf24f8ffc82fb6efec2ae600686e699","Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b < aab1880058ac767d3ea9388a9a7221c776c22c44","Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b < c8a109c9e23a2c7fd548473dde728b2cb8188146","Linux >= 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b < c22f91d82cb9a29d22bdffdce6c803467984ad0c","Linux >= 5.15.121 < 5.15.221","Linux >= 6.1.40 < 6.1.188","Linux 6.2"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:07.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89779","references":[{"url":"https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T08:52:29.594Z","epss":0.00688,"epssPercentile":0.50872,"slug":"CVE-2026-89779","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205277,"id":"CVE-2026-89779","ts":1789570706060,"field":"cvss","old":null,"new":"9.1"},{"seq":205276,"id":"CVE-2026-89779","ts":1789570706060,"field":"severity","old":"none","new":"critical"}]}