Client crash via unvalidated SMB response offset
Published Jan 15, 2024 · Updated Aug 10, 2026
Integer underflow in the Linux kernel SMB client allows attackers to crash clients through a malicious SMB server response. In receive_encrypted_standard, a server-controlled NextCommand offset is subtracted from the PDU length and passed to memcpy without first checking that the offset fits within the PDU. Exploitation requires a client to connect to and mount content from the malicious server; the established consequence is a client crash.
Summary
What happened
Integer underflow in the Linux kernel SMB client allows attackers to crash clients through a malicious SMB server response. In receive_encrypted_standard, a server-controlled NextCommand offset is subtracted from the PDU length and passed to memcpy without first checking that the offset fits within the PDU. Exploitation requires a client to connect to and mount content from the malicious server; the established consequence is a client crash.
The record
- CVE
- CVE-2024-0565
- Published
- Jan 15, 2024
- Updated
- Aug 10, 2026
- Vendor
- Red Hat
- Product
- Red Hat Enterprise Linux 8
- Classifications
- CWE-191, T1499
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 15, 2024CVE publishedPublication date reported by the CVE source.
- Aug 10, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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