CVE-2016-9793 Amazon Linux Security Advisory for kernel: ALAS-2017-782

A flaw was found in the Linux kernel key management subsystem in which a local attacker could crash the kernel or corrupt the stack and additional memory (denial of service) by supplying a specially crafted RSA key. This flaw panics the machine during the verification of the RSA key. (CVE-2016-8650 )

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device. (CVE-2016-9576 )

The sock_setsockopt function in net/core/sock.c in the Linux kernel before 4.8.14 mishandles negative values of sk_sndbuf and sk_rcvbuf, which allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact by leveraging the CAP_NET_ADMIN capability for a crafted setsockopt system call with the (1) SO_SNDBUFFORCE or (2) SO_RCVBUFFORCE option. (CVE-2016-9793 )

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

Please refer to Amazon advisory ALAS-2017-782 for affected packages and patching details, or update with your package manager.

Patch:
Following are links for downloading patches to fix the vulnerabilities:

ALAS-2017-782: Amazon Linux (kernel (4.4.39-34.54.amzn1) on noarch)

ALAS-2017-782: Amazon Linux (kernel (4.4.39-34.54.amzn1) on x86_64)

ALAS-2017-782: Amazon Linux (kernel (4.4.39-34.54.amzn1) on src)

ALAS-2017-782: Amazon Linux (kernel (4.4.39-34.54.amzn1) on i686)