138 lines
7.4 KiB
JSON
138 lines
7.4 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-2026-90132",
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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": "2026-09-11T19:38:34.788Z",
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"datePublished": "2026-09-17T16:06:32.576Z",
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"dateUpdated": "2026-10-19T08:58:30.496Z"
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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": "2026-10-19T08:58:30.496Z"
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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\nntfs: reject unprivileged writes to reserved $LX* xattrs\n\nReject setxattr of the reserved $LXUID, $LXGID, $LXMOD and $LXDEV names\nfrom userspace unless the caller has CAP_SYS_ADMIN."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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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:L - The attacker-controlled $LXUID/$LXGID/$LXMOD/$LXDEV name and 4-byte value enter via setxattr/fsetxattr/lsetxattr into ntfs_setxattr(); ksmbd SMB2 SET_INFO and nfsd4_decode_xattr_name both prefix user., so those paths cannot store the unprefixed EAs that ntfs_ea_get_wsl_inode() loads.\nAC:L - ntfs_setxattr() persists the EAs through ntfs_set_ea() without changing live i_uid/i_mode; the attacker then drops refs and forces icache reclaim so ntfs_read_locked_inode() runs ntfs_ea_get_wsl_inode() and applies the planted uid and S_ISUID mode. No uninfluenced race is required.\nPR:L - xattr_permission() only requires inode_permission(MAY_WRITE) for these unprefixed names, and pre-fix ntfs_setxattr() had no capable() check. Default ntfs mounts leave vol->uid INVALID_UID (so $LXUID is applied) and files mode 0777, so any unprivileged writer can set the EAs.\nUI:N - The attacker issues setxattr on a file they can already write on an ntfs volume that is already mounted; no other user must insert media, mount an image, or open the planted file.\nS:U - ntfs_ea_get_wsl_inode() copies planted $LXUID/$LXMOD into the host inode's i_uid and i_mode. That is local privilege escalation inside the same kernel authority, not a VM, IOMMU, or sandbox escape.\nC:H - On reload, ntfs_ea_get_wsl_inode() does i_uid_write() from $LXUID and assigns inode->i_mode from $LXMOD; planting uid 0 and S_ISUID on an executable the attacker wrote yields euid 0 and full disclosure of host files.\nI:H - The same $LXUID/$LXMOD plant lets the attacker execute their own binary as root after ntfs_read_locked_inode() reloads the inode, giving unrestricted modification of host data. The bug is an unauthorized write of kernel-trusted WSL permission EAs.\nA:N - ntfs_set_ea() of $LXUID/$LXGID/$LXMOD/$LXDEV only stores NTFS extended attributes, and ntfs_ea_get_wsl_inode() only assigns i_uid, i_gid, i_mode, and rdev. That path has no kernel crash, hang, UAF, or BUG_ON."
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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/ntfs/ea.c"
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],
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"versions": [
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{
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"version": "fc053f05ca282a5e760b41f6560ac835c4e28037",
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"lessThan": "86f46508016bc1f2bffb3a52dc2664f942fb9802",
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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": "fc053f05ca282a5e760b41f6560ac835c4e28037",
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"lessThan": "ea6a67ef64451d2da298f15baa35865b4bb6372a",
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"status": "affected",
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"versionType": "git"
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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/ntfs/ea.c"
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],
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"versions": [
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{
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"version": "7.1",
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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": "7.1",
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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": "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": "7.1",
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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": "7.1",
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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/86f46508016bc1f2bffb3a52dc2664f942fb9802"
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},
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{
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"url": "https://git.kernel.org/stable/c/ea6a67ef64451d2da298f15baa35865b4bb6372a"
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}
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],
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"title": "ntfs: reject unprivileged writes to reserved $LX* xattrs",
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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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} |