{"api_version":"1","generated_at":"2026-10-28T16:52:39+00:00","cve":"CVE-2026-99052","urls":{"html":"https://cve.report/CVE-2026-99052","api":"https://cve.report/api/cve/CVE-2026-99052.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99052","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99052"},"summary":{"title":"selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-23 13:17:28","updated_at":"2026-10-23 13:17:28"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b","name":"https://git.kernel.org/stable/c/5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a6da93c625b3557dd23ff6db45d2d1bafeae1565","name":"https://git.kernel.org/stable/c/a6da93c625b3557dd23ff6db45d2d1bafeae1565","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a545def625860d4ccedc14fe45e884a62a041cef","name":"https://git.kernel.org/stable/c/a545def625860d4ccedc14fe45e884a62a041cef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/28b7260548af3d35773477993ad4e4de41578dd7","name":"https://git.kernel.org/stable/c/28b7260548af3d35773477993ad4e4de41578dd7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c997832414f1d846de0a1fa38d7d4f62ba2ea917","name":"https://git.kernel.org/stable/c/c997832414f1d846de0a1fa38d7d4f62ba2ea917","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99052","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99052","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 a545def625860d4ccedc14fe45e884a62a041cef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 a6da93c625b3557dd23ff6db45d2d1bafeae1565 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 c997832414f1d846de0a1fa38d7d4f62ba2ea917 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 28b7260548af3d35773477993ad4e4de41578dd7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.160 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.57 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.11 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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":"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":"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"3.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"3.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.57","versionStartIncluding":"3.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.11","versionStartIncluding":"3.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"3.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-10-23T12:22:34.168Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99052","datePublished":"2026-10-23T12:22:34.168Z","dateReserved":"2026-09-25T10:25:14.388Z","dateUpdated":"2026-10-23T12:22:34.168Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-23 13:17:28","lastModifiedDate":"2026-10-23 13:17:28","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99052","Ordinal":"1","Title":"selinux: preserve NATIVE_LABELS on already-initialized sb in set","CVE":"CVE-2026-99052","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99052","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"selinux: preserve NATIVE_LABELS on already-initialized sb in set"}]}}}