Amazon Linux AMI : kernel (ALAS-2012-100)
Medium Nessus Plugin ID 69590
SynopsisThe remote Amazon Linux AMI host is missing a security update.
DescriptionA flaw was found in the way the Linux kernel's Event Poll (epoll) subsystem handled large, nested epoll structures. A local, unprivileged user could use this flaw to cause a denial of service.
A malicious Network File System version 4 (NFSv4) server could return a crafted reply to a GETACL request, causing a denial of service on the client.
The rds_ib_xmit function in net/rds/ib_send.c in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux kernel 3.7.4 and earlier allows local users to cause a denial of service (BUG_ON and kernel panic) by establishing an RDS connection with the source IP address equal to the IPoIB interface's own IP address, as demonstrated by rds-ping.
SolutionRun 'yum update kernel' to update your system. You will need to reboot your system in order for the new kernel to be running.