CVE-2026-89779

CVE CVE-2026-89779EUVD EUVD-2026-80300Published 2026-09-16T08:48:19.000ZLast changed 2026-09-16T14:38:31.000ZCVSS 9.1

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <aab1880058ac767d3ea9388a9a7221c776c22c44; 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <d585ed08308909c7e6fefb4e8a258aeb29b19ff9; 000a9a72efa4a9df289bab9c9e8ba1639c72e0d6 <28a924c7e67e6d71abeb04860b61166fecb027fc; patch: 6.6.157; patch: 6.18.52; patch: 5.15.221; patch: 7.2.6; 5.15.121 <5.15.221; 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <077df8464cf24f8ffc82fb6efec2ae600686e699; 6.1.40 <6.1.188; 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <c22f91d82cb9a29d22bdffdce6c803467984ad0c; 6.2; patch: 0; 333feb7ba84f69f9b423422417aaac54fd9e7c84 <b27e68ad818a4ca2cef8f35f97e75d756714c818; patch: 7.3-rc1; patch: 6.1.188; patch: 6.12.110; 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b <c8a109c9e23a2c7fd548473dde728b2cb8188146

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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