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.
CVE-2026-89779
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89779
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "333feb7ba84f69f9b423422417aaac54fd9e7c84",
"lessThan": "b27e68ad818a4ca2cef8f35f97e75d756714c818",
"versionType": "git"
},
{
"status": "affected",
"version": "000a9a72efa4a9df289bab9c9e8ba1639c72e0d6",
"lessThan": "28a924c7e67e6d71abeb04860b61166fecb027fc",
"versionType": "git"
},
{
"status": "affected",
"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
"lessThan": "d585ed08308909c7e6fefb4e8a258aeb29b19ff9",
"versionType": "git"
},
{
"status": "affected",
"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
"lessThan": "077df8464cf24f8ffc82fb6efec2ae600686e699",
"versionType": "git"
},
{
"status": "affected",
"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
"lessThan": "aab1880058ac767d3ea9388a9a7221c776c22c44",
"versionType": "git"
},
{
"status": "affected",
"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
"lessThan": "c8a109c9e23a2c7fd548473dde728b2cb8188146",
"versionType": "git"
},
{
"status": "affected",
"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
"lessThan": "c22f91d82cb9a29d22bdffdce6c803467984ad0c",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.121",
"lessThan": "5.15.221",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.40",
"lessThan": "6.1.188",
"versionType": "semver"
}
],
"programFiles": [
"fs/ntfs3/xattr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ntfs3/xattr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89779
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #35246 · Revision 1
- Added to Heist Feed
- Publisher date