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Date: Tue, 24 Mar 2009 20:21:27 -0400 (EDT)
From: "Steven M. Christey" <>
cc: "Steven M. Christey" <>
Subject: Re: CVE request: kernel: nfsd did not drop CAP_MKNOD
 for non-root

Name: CVE-2009-1072
Status: Candidate
Reference: MLIST:[linux-kernel] 20090311 VFS, NFS security bug? Should CAP_MKNOD and CAP_LINUX_IMMUTABLE be added to CAP_FS_MASK?
Reference: URL:
Reference: CONFIRM:;a=commitdiff;h=76a67ec6fb79ff3570dcb5342142c16098299911
Reference: CONFIRM:
Reference: SECUNIA:34422
Reference: URL:
Reference: SECUNIA:34432
Reference: URL:
Reference: VUPEN:ADV-2009-0802
Reference: URL:
Reference: XF:linux-kernel-capmknod-security-bypass(49356)
Reference: URL:

nfsd in the Linux kernel before does not drop the CAP_MKNOD
capability before handling a user request in a thread, which allows
local users to create device nodes, as demonstrated on a filesystem
that has been exported with the root_squash option.

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