CVE-2026-99052 (GCVE-0-2026-99052)
Vulnerability from cvelistv5
Published
2026-10-23 12:22
Modified
2026-10-30 12:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts When an NFSv4 filesystem exported with security_label is mounted a second time, sget_fc() returns the existing superblock and nfs_get_root() calls security_sb_set_mnt_opts() again on it. Since the superblock is already SB_INITIALIZED, selinux_set_mnt_opts() takes an early exit without setting SECURITY_LSM_NATIVE_LABELS in *set_kern_flags. nfs_get_root() then sees kflags without SECURITY_LSM_NATIVE_LABELS set and clears NFS_CAP_SECURITY_LABEL on the shared nfs_server, silently disabling per-file labeling for both the new and the original mount. Commit 3815a245b501 ("security/selinux: fix SECURITY_LSM_NATIVE_LABELS on reused superblock") fixed the same problem in selinux_sb_clone_mnt_opts(). The reused-superblock path for a plain second mount now goes through sb_set_mnt_opts rather than sb_clone_mnt_opts, so it needs the same treatment: on both SE_SBINITIALIZED early exits, set SECURITY_LSM_NATIVE_LABELS in *set_kern_flags when the superblock was already using SECURITY_FS_USE_NATVE.
References
Impacted products
Vendor Product Version
Linux Linux Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
Version: eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864
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{
  "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",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "3.11"
            },
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.273",
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            {
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              "status": "unaffected",
              "version": "5.15.224",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
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              "version": "6.6.160",
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            },
            {
              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.113",
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            },
            {
              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.57",
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              "version": "7.2.11",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "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": "2026-10-30T12:41:19.103Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "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": "2026-10-30T12:41:19.103Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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