Bug 2385244 (CVE-2023-3865)

Summary: CVE-2023-3865 kernel: Out of bounds read in smb2_write
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. The ksmbd_smb2_check_message function does not validate the size of hdr->NextCommand, which may cause an out-of-bounds read of smb2_write, affecting confidentiality and availability.
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Description OSIDB Bzimport 2025-07-30 18:08:58 UTC 
The specific flaw exists within the parsing of smb2_hdr structure. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.