CVE-2011-4080
The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the CAP_SYS_ADMIN capability to modify the dmesg_restrict value, which allows local users to bypass intended access restrictions and read the kernel ring buffer by leveraging root privileges, as demonstrated by a root user in a Linux Containers (aka LXC) environment.
Date published : 2012-05-24
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39