(RHSA-2017:0372) Important: kernel-aarch64 security and bug fix update

The kernel-aarch64 package contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• A race condition was found in the way the Linux kernel’s memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system. (CVE-2016-5195, Important)

• Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q) OR Virtual eXtensible Local Area Network(CONFIG_VXLAN) with Transparent Ethernet Bridging(TEB) GRO support, is vulnerable to a stack overflow issue. It could occur while receiving large packets via GRO path, as an unlimited recursion could unfold in both VLAN and TEB modules, leading to a stack corruption in the kernel. (CVE-2016-7039, Important)

Red Hat would like to thank Phil Oester for reporting CVE-2016-5195.

Bug Fix(es):

• Previously, the operating system did not support the Mellanox ConnectX-4 PCIe Network Interface Controllers (NIC) in Ethernet mode. This update enables Ethernet support in the mlx5 driver. As a result, the Mellanox ConnectX-4 PCIe NICs now work in Ethernet mode as expected. (BZ#1413108)

• On the Qualcomm Datacenter Technologies server platform with Qualcomm Datacenter Technologies Centriq 2400 CPU (QDF2400v1) memory accesses sometimes allocated Translation Lookaside Buffer (TLB) entries using an incorrect Address Space ID (ASID). This could consequently result in memory corruption and crashes under certain conditions. The underlying source code has been modified to handle the TTBRx_EL1[ASID] and TTBRx_EL1[BADDR] fields separately using a reserved ASID, and the described problem no longer occurs. (BZ#1421765)