CVE-2023-38431
CriticalCVSS 9.1Exploitation Probability (EPSS)
Elevated risk60th percentile - higher than 60% of all known CVEs
Summary
An issue was discovered in the Linux kernel before 6.3.8 related to the lack of validation of the NetBIOS header's length in relation to SMB header sizes in ksmbd. This leads to an out-of-bounds read.
Risk Assessment
Organizations may be exposed to attacks that exploit this vulnerability for unauthorized memory access, potentially leading to the disclosure of sensitive information.
Recommendation
It is recommended to update the Linux kernel to version 6.3.8 or later to mitigate this vulnerability.
Original NVD description (English source)
An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/connection.c in ksmbd does not validate the relationship between the NetBIOS header's length field and the SMB header sizes, via pdu_size in ksmbd_conn_handler_loop, leading to an out-of-bounds read.