CVE-2024-49996
CriticalCVSS 9.4Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
A vulnerability related to buffer overflow when parsing NFS reparse points has been fixed in the Linux kernel. The issue stemmed from incorrect calculation of the data buffer size, leading to access beyond its bounds.
Risk Assessment
Improper memory management could lead to system crashes or allow an attacker to execute malicious code. Organizations should be aware of the risks associated with data security and system stability.
Recommendation
It is recommended to update the Linux kernel to the latest version to mitigate this vulnerability. Additionally, systems should be monitored for unauthorized access and abnormal behavior.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix buffer overflow when parsing NFS reparse points ReparseDataLength is sum of the InodeType size and DataBuffer size. So to get DataBuffer size it is needed to subtract InodeType's size from ReparseDataLength. Function cifs_strndup_from_utf16() is currentlly accessing buf->DataBuffer at position after the end of the buffer because it does not subtract InodeType size from the length. Fix this problem and correctly subtract variable len. Member InodeType is present only when reparse buffer is large enough. Check for ReparseDataLength before accessing InodeType to prevent another invalid memory access. Major and minor rdev values are present also only when reparse buffer is large enough. Check for reparse buffer size before calling reparse_mkdev().