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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-89779

fs/ntfs3: validate ef->size covers the record's name and value

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 333feb7ba84f69f9b423422417aaac54fd9e7c84 to < b27e68ad818a4ca2cef8f35f97e75d756714c818affected
  • 000a9a72efa4a9df289bab9c9e8ba1639c72e0d6 to < 28a924c7e67e6d71abeb04860b61166fecb027fcaffected
  • 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to < d585ed08308909c7e6fefb4e8a258aeb29b19ff9affected
  • 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to < 077df8464cf24f8ffc82fb6efec2ae600686e699affected
  • 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to < aab1880058ac767d3ea9388a9a7221c776c22c44affected
  • 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to < c8a109c9e23a2c7fd548473dde728b2cb8188146affected
  • 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b to < c22f91d82cb9a29d22bdffdce6c803467984ad0caffected
  • 5.15.121 to < 5.15.221affected
  • 6.1.40 to < 6.1.188affected

Linux Linux

Default version status: affected

  • 6.2affected
  • 0 to < 6.2unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.110 to ≤ 6.12.*unaffected
  • 6.18.52 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References