CVE-2026-90132

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90132", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.788Z", "datePublished": "2026-09-17T16:06:32.576Z", "dateUpdated": "2026-10-19T08:58:30.496Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:58:30.496Z"}, "descriptions": [{"lang": "en", "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs/ea.c"], "versions": [{"version": "fc053f05ca282a5e760b41f6560ac835c4e28037", "lessThan": "86f46508016bc1f2bffb3a52dc2664f942fb9802", "status": "affected", "versionType": "git"}, {"version": "fc053f05ca282a5e760b41f6560ac835c4e28037", "lessThan": "ea6a67ef64451d2da298f15baa35865b4bb6372a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs/ea.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/86f46508016bc1f2bffb3a52dc2664f942fb9802"}, {"url": "https://git.kernel.org/stable/c/ea6a67ef64451d2da298f15baa35865b4bb6372a"}], "title": "ntfs: reject unprivileged writes to reserved $LX* xattrs", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs/ea.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "86f46508016bc1f2bffb3a52dc2664f942fb9802", "status": "affected", "version": "fc053f05ca282a5e760b41f6560ac835c4e28037", "versionType": "git"}, {"lessThan": "ea6a67ef64451d2da298f15baa35865b4bb6372a", "status": "affected", "version": "fc053f05ca282a5e760b41f6560ac835c4e28037", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs/ea.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-90132", "lastModified": "2026-10-19T09:19:02.950", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:05.733", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86f46508016bc1f2bffb3a52dc2664f942fb9802"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ea6a67ef64451d2da298f15baa35865b4bb6372a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fc053f05ca282a5e760b41f6560ac835c4e28037,86f46508016bc1f2bffb3a52dc2664f942fb9802)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fc053f05ca282a5e760b41f6560ac835c4e28037,ea6a67ef64451d2da298f15baa35865b4bb6372a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-18T18:45:12.442266+00:00", "updated": "2026-09-20T02:30:17.219921+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-284", "CWE-732"]}