Date: Wed, 23 Jul 2014 18:40:12 +0400 From: Vasily Averin <vvs@...allels.com> To: oss-security@...ts.openwall.com Subject: CVE request: kernel: vfs: refcount issues during unmount on symlink https://bugzilla.redhat.com/show_bug.cgi?id=1122472 " A flaw was found in the way reference counting was handled in the Linux kernel's VFS subsystem when unmount on symlink was performed. On Red Hat Enterprise Linux 6 an unprivileged local user could use this flaw to cause OOM conditions leading to denial of service or, potentially, trigger use-after-free error. On Red Hat Enterprise Linux 7 a privileged local user with CAP_SYS_ADMIN capability (also in a container) could use this flaw to cause OOM conditions leading to denial of service or, potentially, trigger use-after-free error. Acknowledgements: Red Hat would like to thank Vasily Averin of Parallels for reporting this issue. " https://lkml.org/lkml/2014/7/21/98 Problem was fixed in OpenVZ kernel 2.6.32-042stab092.3 https://openvz.org/Download/kernel/rhel6/042stab092.3/changes Also I would like to add that KernelCare project (http://kernelcare.com) have released a live hot update for this issue, both for affected OpenVZ and RHEL6 kernels. http://www.cloudlinux.com/blog/clnews/kernelcare-update-for-openvz-pcs-and-centosrhel-6-kernels-psbm28104.php Thank you, Vasily Averin
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