CVE-2026-99052 is a vulnerability in Linux Kernel
Published on October 23, 2026
selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts
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.
Products Associated with CVE-2026-99052
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Affected Versions
Linux:- Version eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 and below a545def625860d4ccedc14fe45e884a62a041cef is affected.
- Version eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 and below a6da93c625b3557dd23ff6db45d2d1bafeae1565 is affected.
- Version eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 and below 5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b is affected.
- Version eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 and below c997832414f1d846de0a1fa38d7d4f62ba2ea917 is affected.
- Version eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 and below 28b7260548af3d35773477993ad4e4de41578dd7 is affected.
- Version 3.11 is affected.
- Before 3.11 is unaffected.
- Version 6.6.160, <= 6.6.* is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.