{"id":"CVE-2026-99052","state":"PUBLISHED","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.","publishedAt":"2026-10-23T12:22:34.168Z","updatedAt":"2026-10-30T12:41:19.103Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"22987d24a159ed7df3cdc9090ca5d61e58df0cac","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"dc579e43b13cb65e55eabaae4f1a950e43567fb1","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"a545def625860d4ccedc14fe45e884a62a041cef","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"a6da93c625b3557dd23ff6db45d2d1bafeae1565","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"c997832414f1d846de0a1fa38d7d4f62ba2ea917","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"28b7260548af3d35773477993ad4e4de41578dd7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/selinux/hooks.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.11","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/selinux/hooks.c"]}],"references":["https://git.kernel.org/stable/c/22987d24a159ed7df3cdc9090ca5d61e58df0cac","https://git.kernel.org/stable/c/2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039","https://git.kernel.org/stable/c/dc579e43b13cb65e55eabaae4f1a950e43567fb1","https://git.kernel.org/stable/c/a545def625860d4ccedc14fe45e884a62a041cef","https://git.kernel.org/stable/c/a6da93c625b3557dd23ff6db45d2d1bafeae1565","https://git.kernel.org/stable/c/5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b","https://git.kernel.org/stable/c/c997832414f1d846de0a1fa38d7d4f62ba2ea917","https://git.kernel.org/stable/c/28b7260548af3d35773477993ad4e4de41578dd7"],"weaknesses":[],"ingestedAt":"2026-10-30T13:02:04.640Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99052.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99052","state":"PUBLISHED","datePublished":"2026-10-23T12:22:34.168Z","dateUpdated":"2026-10-30T12:41:19.103Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.388Z"},"containers":{"cna":{"title":"selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"22987d24a159ed7df3cdc9090ca5d61e58df0cac","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"2f0f1f5a3b89c1ed67e39be49d29ee7f5c96e039","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"dc579e43b13cb65e55eabaae4f1a950e43567fb1","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"a545def625860d4ccedc14fe45e884a62a041cef","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"a6da93c625b3557dd23ff6db45d2d1bafeae1565","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"c997832414f1d846de0a1fa38d7d4f62ba2ea917","versionType":"git"},{"version":"eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864","status":"affected","lessThan":"28b7260548af3d35773477993ad4e4de41578dd7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/selinux/hooks.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.11","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/selinux/hooks.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:41:19.103Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}