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critical9.4

CVE-2024-49996

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix buffer overflow when parsing NFS reparse points ReparseDataLength is sum of the I…

Impact

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().

Affected products

VendorProductAffected versions
DebianDebian Linux
Version 11.0
LinuxLinux Kernel
from 5.3 before 5.4.287
from 5.5 before 5.10.231
from 5.11 before 5.15.174
from 5.16 before 6.1.120
from 6.2 before 6.6.55
from 6.7 before 6.10.14

Weakness classification

CWE-120

References