The packet_recvmsg function in net/packet/af_packet.c in the Linux kernel before 3.12.4 updates a certain length value before ensuring that an associated data structure has been initialized, which allows local users to obtain sensitive information from kernel memory via a (1) recvfrom, (2) recvmmsg, or (3) recvmsg system call.
https://bugzilla.redhat.com/show_bug.cgi?id=1039845
http://secunia.com/advisories/55882
http://secunia.com/advisories/56036
https://exchange.xforce.ibmcloud.com/vulnerabilities/90131
https://github.com/torvalds/linux/commit/f3d3342602f8bcbf37d7c46641cb9bca7618eb1c
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.12.4
http://www.openwall.com/lists/oss-security/2013/12/31/7
http://www.ubuntu.com/usn/USN-2109-1
http://www.ubuntu.com/usn/USN-2110-1
http://www.ubuntu.com/usn/USN-2113-1
http://www.ubuntu.com/usn/USN-2117-1
http://www.ubuntu.com/usn/USN-2128-1
http://www.ubuntu.com/usn/USN-2129-1
http://www.ubuntu.com/usn/USN-2135-1
http://www.ubuntu.com/usn/USN-2136-1
http://www.ubuntu.com/usn/USN-2138-1
Published: 2014-01-06
Base Score: 4.9
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N
Severity: Medium