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.
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.
Published:
2026-09-16
Score:
n/a
EPSS:
n/a
KEV:
No
Impact:
n/a
Action:
n/a
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
No data available yet.
Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
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References
History
Wed, 16 Sep 2026 09:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | fs/ntfs3: validate ef->size covers the record's name and value | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-16T08:48:19.083Z
Reserved: 2026-09-11T19:38:34.765Z
Link: CVE-2026-89779
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-16T09:17:08.387
Modified: 2026-09-16T09:17:08.387
Link: CVE-2026-89779
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.