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CVE-2026-98994— statmount: read the parent of an unmounted mount under mount_lock

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： statmount：在持有 mount_lock 的情况下读取已卸载挂载点的父挂载点在持有读锁时，通过读取父挂载点的标识符。对于仍处于命名空间中的挂载点，这种做法是安全的，因为该命名空间会锁定其上方所有挂载点。然而，也接受指向一个已被有意卸载、仅由文件描述符维持存活的挂载点的文件描述符。如果该挂载点在卸载时仍附着于其父挂载点，则父挂载点也会被一并卸载，此时没有任何机制能锁定父挂载点以保护子挂载点。最终，仅在持有的情况下卸载子挂载点，并在之后释放父挂载点。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.16% · P5 Updated Oct 23, 2026

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Linux	Linux	`0e5032237ee5530147fbdf33134297e1490d5ec3< 98fc6c7b6ca676157d2c780bd0a537b2c10fe08f`	affected
		`0e5032237ee5530147fbdf33134297e1490d5ec3< bb46094057520304073130920c223451c2a694a7`	affected
		`7.0`	affected
		`< 7.0`	unaffected
		`7.2.11≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

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Vulnerability Information

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Vulnerability Title

statmount: read the parent of an unmounted mount under mount_lock

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: statmount: read the parent of an unmounted mount under mount_lock statmount_mnt_basic() reads the ids of the parent through m->mnt_parent with namespace_sem held for reading. That's fine for a mount that is in a namespace. Everything above it is pinned by that namespace. STATMOUNT_BY_FD also accepts a file descriptor on a mount that has been unmounted on purpose and that only the file descriptor keeps alive. If that mount stayed attached to its parent when it was unmounted the parent is unmounted as well and nothing pins it for the child. The final mntput() unmounts the children under mount_lock alone and frees the parent afterwards. Concurrently, statmount_mnt_basic() reads m->mnt_parent twice while that can happen and can easily dereference a mount that's already gone. Read the parent of an unmounted mount under mount_lock. The parent can't be put while it is held and both ids come from the same mount. A mounted mount's parent is pinned by the namespace and a mount can't leave its namespace while namespace_sem is held, so the common case takes no global lock.

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	0e5032237ee5530147fbdf33134297e1490d5ec3 ~ 98fc6c7b6ca676157d2c780bd0a537b2c10fe08f	-
Linux	Linux	7.0	-

II. Public POCs for CVE-2026-98994

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-98994

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Patches & Fixes for CVE-2026-98994 (1)

🔗 statmount: read the parent of an unmounted mount under mount_lock - kernel/git/stable/linux.git - Linux kernel stable tree Read full article

https://www.cve.org/CVERecord?id=CVE-2026-98994

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-2026-98870	8.8 HIGH	ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980	8.8 HIGH	namei: don't reveal overmounted entries in refwalk
CVE-2026-98981	8.8 HIGH	namespace: unhash a dentry before detaching the mounts on it
CVE-2026-99042	8.4 HIGH	io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978	8.4 HIGH	namespace: never expire a locked mount
CVE-2026-99064	8.1 HIGH	cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968	8.1 HIGH	amt: send the relay's General Query directly from the receive path
CVE-2026-98993	7.8 HIGH	namespace: don't inherit MNT_UMOUNT in clone_mnt()
CVE-2026-99053	7.8 HIGH	tipc: hold a reference to nodes found by link name
CVE-2026-99054	7.8 HIGH	tipc: destroy topsrv workqueues before closing connections
CVE-2026-99056	7.8 HIGH	strparser: make sure __strp_recv isn't running before tearing down the parser
CVE-2026-99002	7.8 HIGH	drm/vmwgfx: validate pitch coming from userspace
CVE-2026-98899	7.8 HIGH	netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99006	7.8 HIGH	drm/i915/gem: Prevent overstepping exec array boundary

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

IV. Related Vulnerabilities

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Same vendor: Linux