James McKenzie has reported a vulnerability in Linux Kernel, which can be exploited by malicious users to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in ext3 when handling an invalid inode number. This can be exploited by sending a specially crafted NFS request with a V2 procedure (e.g. V2_LOOKUP) that specifies an invalid inode number.
Successful exploitation causes the exported directory to be remounted read-only.
The vulnerability has been reported in versions 18.104.22.168, 22.214.171.124, and 126.96.36.199. Other versions may also be affected.
Solution: A patch is committed to the GIT repository.
Provided and/or discovered by: James McKenzie
Original Advisory: http://lkml.org/lkml/2006/7/17/41
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Subject: Linux Kernel Ext3 Invalid Inode Number Denial of Service
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