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Date: Wed, 4 Jul 2012 09:19:50 +0200
From: Petr Matousek <>
Subject: CVE Request -- kernel: epoll: can leak file descriptors when
 returning -ELOOP

An epoll_ctl(,EPOLL_CTL_ADD,,) operation can return '-ELOOP' to prevent
circular epoll dependencies from being created.  However, in that case
we do not properly clear the 'tfile_check_list'.

An unprivileged local user could use this flaw to crash the system.

Regression introduced via 28d82dc1c4edbc352129f97f4ca22624d1fe61de

Upstream fix:


Petr Matousek / Red Hat Security Response Team

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