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CVE-2026-99052— selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： selinux：在 set_mnt_opts 中，对已初始化的超级块（sb）保留 NATIVE_LABELS 标志。 当挂载一个以 security_label 选项导出的 NFSv4 文件系统，且该文件系统被第二次挂载时，sget_fc() 会返回已存在的超级块，随后 nfs_get_root() 会再次调用 security_sb_set_mnt_opts() 处理该超级块。由于该超级块的状态已标记为 SB_INITIALIZED，selinux_set_mnt_o

AI Predicted 5.5 Difficulty: Hard EPSS 0.17% · P6

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864< a545def625860d4ccedc14fe45e884a62a041cef affected
eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864< a6da93c625b3557dd23ff6db45d2d1bafeae1565 affected
eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864< 5509d498e1b9edafebd5a60ba3cb9ecfda23dc2b affected
eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864< c997832414f1d846de0a1fa38d7d4f62ba2ea917 affected
eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864< 28b7260548af3d35773477993ad4e4de41578dd7 affected
3.11 affected
< 3.11 unaffected
6.6.160≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-99052

Vulnerability Information
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Vulnerability Title
selinux: preserve NATIVE_LABELS on already-initialized sb in set_mnt_opts
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux eb9ae686507bc5a5ca78e6b3fbe629cd5cc67864 ~ a545def625860d4ccedc14fe45e884a62a041cef -
Linux Linux 3.11 -

II. Public POCs for CVE-2026-99052

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III. Intelligence Information for CVE-2026-99052

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Patches & Fixes for CVE-2026-99052 (4)

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-99014 7.8 HIGH Bluetooth: hci_sync: Fix command skb lifetime during scan setup
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-99016 7.8 HIGH riscv: futex: untag the user pointer before the atomic access
CVE-2026-99018 7.8 HIGH riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
CVE-2026-99051 7.8 HIGH fsverity: RCU-delay the freeing of struct fsverity_info
CVE-2026-99054 7.8 HIGH tipc: destroy topsrv workqueues before closing connections
CVE-2026-99053 7.8 HIGH tipc: hold a reference to nodes found by link name

Showing top 20 of 217 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux