NFS client hang via NFSD offset overflow
Published Jul 16, 2024 · Updated Aug 5, 2026
Denial of service in Linux NFSD and Siemens SIMATIC S7-1500 TM MFP GNU/Linux subsystem allows remote attackers to hang NFS clients. NFSD implicitly converts an unsigned NFSv3 or NFSv4 READ offset to loff_t, so a near-OFFSET_MAX request overflows and returns NFSERR_INVAL rather than a short result with EOF. Reachability requires access to a writable NFS export on a filesystem that permits a maximum-size sparse file; the resulting retry loop hangs the reader and continuously loads NFSD.
Summary
What happened
Denial of service in Linux NFSD and Siemens SIMATIC S7-1500 TM MFP GNU/Linux subsystem allows remote attackers to hang NFS clients. NFSD implicitly converts an unsigned NFSv3 or NFSv4 READ offset to loff_t, so a near-OFFSET_MAX request overflows and returns NFSERR_INVAL rather than a short result with EOF. Reachability requires access to a writable NFS export on a filesystem that permits a maximum-size sparse file; the resulting retry loop hangs the reader and continuously loads NFSD.
The record
- CVE
- CVE-2022-48827
- Published
- Jul 16, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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Published CVSS scores
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Technologies
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