CVE-2024-49996: Debian Linux

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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

• Debian Debian Linux: version 11.0 only
• Linux Linux Kernel: from 5.3, before 5.4.287 (fixed in 5.4.287); from 5.5, before 5.10.231 (fixed in 5.10.231); from 5.11, before 5.15.174 (fixed in 5.15.174); from 5.16, before 6.1.120 (fixed in 6.1.120); from 6.2, before 6.6.55 (fixed in 6.6.55); from 6.7, before 6.10.14 (fixed in 6.10.14); …

Published 2024-10-21. Last modified 2026-08-04.