Authenticated service interruption via leaked ACL allocations
Published Jul 19, 2026 · Updated Jul 19, 2026
Resource leak in Linux Kernel 6.19 through 7.1.2 allows remote authenticated users to exhaust memory with crafted NFSv4 OPEN requests. In nfsd4_create_file(), a failing start_creating() path bypasses nfsd_attrs_free(), leaving populated POSIX ACL allocations unreleased; the routine also discards nfsd4_acl_to_attr() errors and creates files without requested ACLs. Access requires an authenticated NFS client with create permission on an exported directory; repeated overlong filenames consume kernel memory, while unsupported ACE types cause ACL-free file creation.
Summary
What happened
Resource leak in Linux Kernel 6.19 through 7.1.2 allows remote authenticated users to exhaust memory with crafted NFSv4 OPEN requests. In nfsd4_create_file(), a failing start_creating() path bypasses nfsd_attrs_free(), leaving populated POSIX ACL allocations unreleased; the routine also discards nfsd4_acl_to_attr() errors and creates files without requested ACLs. Access requires an authenticated NFS client with create permission on an exported directory; repeated overlong filenames consume kernel memory, while unsupported ACE types cause ACL-free file creation.
The record
- CVE
- CVE-2026-53396
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-401, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.19
- Affected versionversion=7ab96df840e60eb933abfe65fc5fe44e72f16dc0 <18cf006a08babec0bbac2a3784f8f28e56e47490
- Affected versionversion=7ab96df840e60eb933abfe65fc5fe44e72f16dc0 <24c975bbdd564d7d0ad90294bfa69729830345de
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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