CVE-2026-89779 is a vulnerability in Linux Kernel
Published on September 16, 2026
fs/ntfs3: validate ef->size covers the record's name and value
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: validate ef->size covers the record's name and value
When an EA record has a non-zero ef->size, ntfs_read_ea() only checks
that the record fits in the remaining buffer (ea_size > bytes), not that
ef->size is large enough to hold the record's own name_len + 1 + elength.
A crafted image can pass validation with, e.g., ef->size = 24 but
elength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of
the undersized record, reading past the kmalloc(info->size) allocation
and leaking heap memory to userspace via getxattr():
BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)
Read of size 65535 at addr ffff888100794550 by task exploit
__asan_memcpy (mm/kasan/shadow.c:105)
ntfs_get_ea (fs/ntfs3/xattr.c:302)
ntfs_getxattr (fs/ntfs3/xattr.c:848)
__vfs_getxattr (fs/xattr.c:441)
vfs_getxattr (fs/xattr.c:474)
do_getxattr (fs/xattr.c:800)
path_getxattrat (fs/xattr.c:868)
do_syscall_64 (arch/x86/entry/syscall_64.c:94)
The buggy address is located 80 bytes inside of
allocated 84-byte region in cache kmalloc-96
Compute the size the record needs and require ef->size to cover it.
Products Associated with CVE-2026-89779
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Affected Versions
Linux:- Version 333feb7ba84f69f9b423422417aaac54fd9e7c84 and below b27e68ad818a4ca2cef8f35f97e75d756714c818 is affected.
- Version 000a9a72efa4a9df289bab9c9e8ba1639c72e0d6 and below 28a924c7e67e6d71abeb04860b61166fecb027fc is affected.
- Version 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b and below d585ed08308909c7e6fefb4e8a258aeb29b19ff9 is affected.
- Version 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b and below 077df8464cf24f8ffc82fb6efec2ae600686e699 is affected.
- Version 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b and below aab1880058ac767d3ea9388a9a7221c776c22c44 is affected.
- Version 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b and below c8a109c9e23a2c7fd548473dde728b2cb8188146 is affected.
- Version 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b and below c22f91d82cb9a29d22bdffdce6c803467984ad0c is affected.
- Version 5.15.121 and below 5.15.221 is affected.
- Version 6.1.40 and below 6.1.188 is affected.
- Version 6.2 is affected.
- Before 6.2 is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.6, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.