NFSD service hang via unreleased parent lock
Published Jun 25, 2026 · Updated Jun 25, 2026
Denial of service in Linux Kernel 7.0 through 7.0.12 allows remote attackers to hang NFSD directory operations via NFSv4 OPEN requests. The dentry_create() error path replaces path->dentry with an error pointer after atomic_create() fails, so nfsd4_create_file() passes that pointer to end_creating() and leaves the parent directory lock held. Reachability requires a writable NFS export backed by a filesystem that implements atomic_create(); the retained lock can block later directory operations and consume NFSD threads.
Summary
What happened
Denial of service in Linux Kernel 7.0 through 7.0.12 allows remote attackers to hang NFSD directory operations via NFSv4 OPEN requests. The dentry_create() error path replaces path->dentry with an error pointer after atomic_create() fails, so nfsd4_create_file() passes that pointer to end_creating() and leaves the parent directory lock held. Reachability requires a writable NFS export backed by a filesystem that implements atomic_create(); the retained lock can block later directory operations and consume NFSD threads.
The record
- CVE
- CVE-2026-53244
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=64a989dbd144e0622371396461b11335459692d2 <e824bbd4d224cce4b5fb59cc9dcd3447fe0b7e44
- Affected versionversion=64a989dbd144e0622371396461b11335459692d2 <ee1f40759a50b1800c98c1c369afd5b3e44ad987
- Affected versionversion=7.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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