CVE-2026-99052

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99052", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.388Z", "datePublished": "2026-10-23T12:22:34.168Z", "dateUpdated": "2026-10-30T12:41:19.103Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:41:19.103Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts\n\nWhen an NFSv4 filesystem exported with security_label is mounted a\nsecond time, sget_fc() returns the existing superblock and\nnfs_get_root() calls security_sb_set_mnt_opts() again on it. Since the\nsuperblock is already SB_INITIALIZED, selinux_set_mnt_opts() takes an\nearly exit without setting SECURITY_LSM_NATIVE_LABELS in\n*set_kern_flags. nfs_get_root() then sees kflags without\nSECURITY_LSM_NATIVE_LABELS set and clears NFS_CAP_SECURITY_LABEL on\nthe shared nfs_server, silently disabling per-file labeling for both\nthe new and the original mount.\n\nCommit 3815a245b501 (\"security/selinux: fix SECURITY_LSM_NATIVE_LABELS\non reused superblock\") fixed the same problem in\nselinux_sb_clone_mnt_opts(). The reused-superblock path for a plain\nsecond mount now goes through sb_set_mnt_opts rather than\nsb_clone_mnt_opts, so it needs the same treatment: on both\nSE_SBINITIALIZED early exits, set SECURITY_LSM_NATIVE_LABELS in\n*set_kern_flags when the superblock was already using\nSECURITY_FS_USE_NATVE."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/selinux/hooks.c"], "versions": [{"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "22987d24a159ed7df3cdc9090ca5d61e58df0cac", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "dc579e43b13cb65e55eabaae4f1a950e43567fb1", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "a545def625860d4ccedc14fe45e884a62a041cef", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "a6da93c625b3557dd23ff6db45d2d1bafeae1565", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "c997832414f1d846de0a1fa38d7d4f62ba2ea917", "status": "affected", "versionType": "git"}, {"version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "lessThan": "28b7260548af3d35773477993ad4e4de41578dd7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/selinux/hooks.c"], "versions": [{"version": "3.11", "status": "affected"}, {"version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.11", "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": "3.11", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.2.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/22987d24a159ed7df3cdc9090ca5d61e58df0cac"}, {"url": "https://git.kernel.org/stable/c/2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039"}, {"url": "https://git.kernel.org/stable/c/dc579e43b13cb65e55eabaae4f1a950e43567fb1"}, {"url": "https://git.kernel.org/stable/c/a545def625860d4ccedc14fe45e884a62a041cef"}, {"url": "https://git.kernel.org/stable/c/a6da93c625b3557dd23ff6db45d2d1bafeae1565"}, {"url": "https://git.kernel.org/stable/c/5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b"}, {"url": "https://git.kernel.org/stable/c/c997832414f1d846de0a1fa38d7d4f62ba2ea917"}, {"url": "https://git.kernel.org/stable/c/28b7260548af3d35773477993ad4e4de41578dd7"}], "title": "selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["security/selinux/hooks.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "22987d24a159ed7df3cdc9090ca5d61e58df0cac", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "dc579e43b13cb65e55eabaae4f1a950e43567fb1", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "a545def625860d4ccedc14fe45e884a62a041cef", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "a6da93c625b3557dd23ff6db45d2d1bafeae1565", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "c997832414f1d846de0a1fa38d7d4f62ba2ea917", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}, {"lessThan": "28b7260548af3d35773477993ad4e4de41578dd7", "status": "affected", "version": "eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["security/selinux/hooks.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.11"}, {"lessThan": "3.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.11", "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\nselinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts\n\nWhen an NFSv4 filesystem exported with security_label is mounted a\nsecond time, sget_fc() returns the existing superblock and\nnfs_get_root() calls security_sb_set_mnt_opts() again on it. Since the\nsuperblock is already SB_INITIALIZED, selinux_set_mnt_opts() takes an\nearly exit without setting SECURITY_LSM_NATIVE_LABELS in\n*set_kern_flags. nfs_get_root() then sees kflags without\nSECURITY_LSM_NATIVE_LABELS set and clears NFS_CAP_SECURITY_LABEL on\nthe shared nfs_server, silently disabling per-file labeling for both\nthe new and the original mount.\n\nCommit 3815a245b501 (\"security/selinux: fix SECURITY_LSM_NATIVE_LABELS\non reused superblock\") fixed the same problem in\nselinux_sb_clone_mnt_opts(). The reused-superblock path for a plain\nsecond mount now goes through sb_set_mnt_opts rather than\nsb_clone_mnt_opts, so it needs the same treatment: on both\nSE_SBINITIALIZED early exits, set SECURITY_LSM_NATIVE_LABELS in\n*set_kern_flags when the superblock was already using\nSECURITY_FS_USE_NATVE."}], "id": "CVE-2026-99052", "lastModified": "2026-10-30T13:21:41.817", "metrics": {}, "published": "2026-10-23T13:17:28.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/22987d24a159ed7df3cdc9090ca5d61e58df0cac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/28b7260548af3d35773477993ad4e4de41578dd7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a545def625860d4ccedc14fe45e884a62a041cef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a6da93c625b3557dd23ff6db45d2d1bafeae1565"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c997832414f1d846de0a1fa38d7d4f62ba2ea917"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc579e43b13cb65e55eabaae4f1a950e43567fb1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts", "id": "2559765", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559765"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-281", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nselinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts\nWhen an NFSv4 filesystem exported with security_label is mounted a\nsecond time, sget_fc() returns the existing superblock and\nnfs_get_root() calls security_sb_set_mnt_opts() again on it. Since the\nsuperblock is already SB_INITIALIZED, selinux_set_mnt_opts() takes an\nearly exit without setting SECURITY_LSM_NATIVE_LABELS in\n*set_kern_flags. nfs_get_root() then sees kflags without\nSECURITY_LSM_NATIVE_LABELS set and clears NFS_CAP_SECURITY_LABEL on\nthe shared nfs_server, silently disabling per-file labeling for both\nthe new and the original mount.\nCommit 3815a245b501 (\"security/selinux: fix SECURITY_LSM_NATIVE_LABELS\non reused superblock\") fixed the same problem in\nselinux_sb_clone_mnt_opts(). The reused-superblock path for a plain\nsecond mount now goes through sb_set_mnt_opts rather than\nsb_clone_mnt_opts, so it needs the same treatment: on both\nSE_SBINITIALIZED early exits, set SECURITY_LSM_NATIVE_LABELS in\n*set_kern_flags when the superblock was already using\nSECURITY_FS_USE_NATVE.", "A flaw was found in the Linux kernel. When a Network File System version 4 (NFSv4) share configured with security labels is mounted multiple times, the Security-Enhanced Linux (SELinux) subsystem fails to preserve native labeling flags on the reused filesystem. This flaw allows a local user to silently disable per-file security labeling across both existing and new mounts, leading to a bypass of mandatory access control policies."], "name": "CVE-2026-99052", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99052\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99052\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-99052.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,a545def625860d4ccedc14fe45e884a62a041cef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,a6da93c625b3557dd23ff6db45d2d1bafeae1565)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,c997832414f1d846de0a1fa38d7d4f62ba2ea917)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,28b7260548af3d35773477993ad4e4de41578dd7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.160,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.57,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.11,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,a545def625860d4ccedc14fe45e884a62a041cef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,a6da93c625b3557dd23ff6db45d2d1bafeae1565)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,c997832414f1d846de0a1fa38d7d4f62ba2ea917)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864,28b7260548af3d35773477993ad4e4de41578dd7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"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": "3.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.160,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.57,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.11,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-23T16:00:18.684271+00:00", "updated": "2026-10-27T19:45:07.721149+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}