CVE-2017-6353 Amazon Linux Security Advisory for kernel: ALAS-2017-814

Package updates are available for Amazon Linux AMI that fix the following vulnerabilities:
CVE-2017-6353: It was found that the code in net/sctp/socket.c in the Linux kernel through 4.10.1 does not properly restrict association peel-off operations during certain wait states, which allows local users to cause a denial of service (invalid unlock and double free) via a multithreaded application. This vulnerability was introduced by CVE-2017-5986 fix (commit 2dcab5984841). 1428907: CVE-2017-6353 kernel: Possible double free in stcp_sendmsg() (incorrect fix for CVE-2017-5986)
CVE-2017-5986: It was reported that with Linux kernel, earlier than version v4.10-rc8, an application may trigger a BUG_ON in sctp_wait_for_sndbuf if the socket tx buffer is full, a thread is waiting on it to queue more data, and meanwhile another thread peels off the association being used by the first thread. 1420276: CVE-2017-5986 kernel: Reachable BUG_ON from userspace in sctp_wait_for_sndbuf
CVE-2017-5669: The do_shmat function in ipc/shm.c in the Linux kernel, through 4.9.12, does not restrict the address calculated by a certain rounding operation. This allows privileged local users to map page zero and, consequently, bypass a protection mechanism that exists for the mmap system call. This is possible by making crafted shmget and shmat system calls in a privileged context. 1427239: CVE-2017-5669 kernel: Shmat allows mmap null page protection bypass

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

Please refer to Amazon advisory ALAS-2017-814 for affected packages and patching details, or update with your package manager.

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

ALAS-2017-814