CVE-2024-49996

high

Description

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().

References

https://git.kernel.org/stable/c/e2a8910af01653c1c268984855629d71fb81f404

https://git.kernel.org/stable/c/c6db81c550cea0c73bd72ef55f579991e0e4ba07

https://git.kernel.org/stable/c/c173d47b69f07cd7ca08efb4e458adbd4725d8e9

https://git.kernel.org/stable/c/803b3a39cb096d8718c0aebc03fd19f11c7dc919

Details

Source: Mitre, NVD

Published: 2024-10-21

Updated: 2024-10-25

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High