MGASA-2017-0003

This update is based on upstream 4.4.39 and fixes at least the following security issues:

Due to lack of size checking on ICMP header length, it is possible to cause out-of-bounds read on stack (CVE-2016-8399)

The TCP stack in the Linux kernel before 4.8.10 mishandles skb truncation, which allows local users to cause a denial of service (system crash) via a crafted application that makes sendto system calls, related to net/ipv4/tcpipv4.c and net/ipv6/tcpipv6.c (CVE-2016-8645).

The mpipowm function in lib/mpi/mpi-pow.c in the Linux kernel through 4.8.11 does not ensure that memory is allocated for limb data, which allows local users to cause a denial of service (stack memory corruption and panic) via an addkey system call for an RSA key with a zero exponent (CVE-2016-8650).

A race condition issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKETV3 ring buffer. A local user able to open a raw packet socket (requires the CAPNET_RAW capability) could use this flaw to elevate their privileges on the system (CVE-2016-8655).

A use-after-free vulnerability in the SCSI generic driver allows users with write access to /dev/sg* or /dev/bsg* to elevate their privileges (CVE-2016-9576).

Linux kernel built with the Kernel-based Virtual Machine(CONFIG_KVM) support is vulnerable to an information leakage issue. It could occur on x86 platform, while emulating instructions in 32bit mode. A user/process could use this flaw to leak host kernel memory bytes (CVE-2016-9756).

A bug in SO{SND|RCV}BUFFORCE setsockopt() implementation allows CAPNETADMIN users to set negative sksndbuf or sk_rcvbuf values. A user could use this flaw to cause various memory corruptions, crashes and OOM (CVE-2016-9793).

A use-after-free vulnerability was found in ALSA pcm layer, which allows local users to cause a denial of service, memory corruption, or possibly other unspecified impact (CVE-2016-9794).

For other upstream fixes in this update, see the referenced changelogs.