The ax25_getname function in net/ax25/af_ax25.c in the Linux kernel before 2.6.37-rc2 does not initialize a certain structure, which allows local users to obtain potentially sensitive information from kernel stack memory by reading a copy of this structure.
http://marc.info/?l=linux-netdev&m=128854507120898&w=2
http://openwall.com/lists/oss-security/2010/11/02/7
http://openwall.com/lists/oss-security/2010/11/04/5
http://www.debian.org/security/2010/dsa-2126
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.37-rc2
http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
http://www.mandriva.com/security/advisories?name=MDVSA-2011:051