255 lines
14 KiB
JSON
255 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89779",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.765Z",
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"datePublished": "2026-09-16T08:48:19.083Z",
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"dateUpdated": "2026-10-19T08:52:31.490Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:52:31.490Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate ef->size covers the record's name and value\n\nWhen an EA record has a non-zero ef->size, ntfs_read_ea() only checks\nthat the record fits in the remaining buffer (ea_size > bytes), not that\nef->size is large enough to hold the record's own name_len + 1 + elength.\n\nA crafted image can pass validation with, e.g., ef->size = 24 but\nelength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of\nthe undersized record, reading past the kmalloc(info->size) allocation\nand leaking heap memory to userspace via getxattr():\n\n BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302)\n Read of size 65535 at addr ffff888100794550 by task exploit\n __asan_memcpy (mm/kasan/shadow.c:105)\n ntfs_get_ea (fs/ntfs3/xattr.c:302)\n ntfs_getxattr (fs/ntfs3/xattr.c:848)\n __vfs_getxattr (fs/xattr.c:441)\n vfs_getxattr (fs/xattr.c:474)\n do_getxattr (fs/xattr.c:800)\n path_getxattrat (fs/xattr.c:868)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n\n The buggy address is located 80 bytes inside of\n allocated 84-byte region in cache kmalloc-96\n\nCompute the size the record needs and require ef->size to cover it."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - ntfs3 registers export_operations and an empty-prefix xattr handler, so ksmbd SMB2 QUERY_INFO FILE_FULL_EA and nfsd GETXATTR reach vfs_getxattr→ntfs_getxattr→ntfs_get_ea on an exported NTFS volume; a crafted EA named user.* is listed and returned over the network on NAS/hybrid SMB/NFS servers.\nAC:L - The attacker fully controls on-disk EA_FULL fields; ef->size=24 with elength=0xffff passes ntfs_read_ea() and makes ntfs_get_ea() memcpy 65535 bytes past the kmalloc(info->size) object deterministically, with no race or attacker-uncontrollable layout.\nPR:N - The leak needs only read access to a file carrying the crafted EA: a ksmbd guest/anonymous client with FILE_READ_EA, an NFSv4 AUTH_SYS/guest GETXATTR, or automount of attacker media, with no local account or CAP_SYS_ADMIN on the host.\nUI:N - After the NTFS volume is mounted and exported—the normal state for NAS, dual-boot, and automounted removable NTFS—the attacker issues SMB QUERY_INFO, NFS GETXATTR, or getxattr(2) themselves; no further victim clicks, prompts, or confirmations are required.\nS:U - The slab over-read and heap leak occur in the host kernel ntfs3 xattr path under a single security authority; this is standard filesystem exploitation, not a VM escape, IOMMU/DMA bypass, or other cross-boundary breakout.\nC:H - ntfs_get_ea() copies attacker-chosen elength (up to 65535) bytes from past the kmalloc(info->size) EA buffer into the getxattr output that VFS, ksmbd, and nfsd return to the caller; a ~64KiB kernel-heap leak to userspace or a remote SMB/NFS client is Confidentiality High.\nI:N - The destination is sized from the probed elength (ksmbd/nfsd) or the caller-supplied size with an explicit len>size ERANGE check, so this is a source over-read into a bounds-checked xattr buffer, not an out-of-bounds write, UAF, or control-flow hijack primitive.\nA:H - KASAN reports a 65535-byte slab-out-of-bounds read in ntfs_get_ea from an 84-byte kmalloc-96 object; that unbounded heap over-read can fault unmapped adjacent slab pages and oops or panic the kernel, which is Availability High."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ntfs3/xattr.c"
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],
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"versions": [
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{
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"version": "333feb7ba84f69f9b423422417aaac54fd9e7c84",
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"lessThan": "b27e68ad818a4ca2cef8f35f97e75d756714c818",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "000a9a72efa4a9df289bab9c9e8ba1639c72e0d6",
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"lessThan": "28a924c7e67e6d71abeb04860b61166fecb027fc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
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"lessThan": "d585ed08308909c7e6fefb4e8a258aeb29b19ff9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
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"lessThan": "077df8464cf24f8ffc82fb6efec2ae600686e699",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
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"lessThan": "aab1880058ac767d3ea9388a9a7221c776c22c44",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
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"lessThan": "c8a109c9e23a2c7fd548473dde728b2cb8188146",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b",
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"lessThan": "c22f91d82cb9a29d22bdffdce6c803467984ad0c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.15.121",
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"lessThan": "5.15.221",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.40",
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"lessThan": "6.1.188",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ntfs3/xattr.c"
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],
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"versions": [
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{
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"version": "6.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.110",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15.121",
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"versionEndExcluding": "5.15.221"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.40",
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"versionEndExcluding": "6.1.188"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.6.157"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.12.110"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.18.52"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818"
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},
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{
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"url": "https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc"
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},
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{
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"url": "https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9"
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},
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{
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"url": "https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699"
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},
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{
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"url": "https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44"
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},
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{
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"url": "https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146"
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},
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{
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"url": "https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c"
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}
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],
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"title": "fs/ntfs3: validate ef->size covers the record's name and value",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |