MGASA-2018-0126

This kernel-tmb update is based on the upstream 4.14.18 and and adds some support for mitigating Spectre, variant 1 (CVE-2017-5753) and as it is built with the retpoline-aware gcc-5.5.0-1.mga6, it now provides full retpoline mitigation for Spectre, variant 2 (CVE-2017-5715).

The BPF interpreter has been used as part of the spectre 2 attack CVE-2017-5715. To make attacker job harder introduce BPFJITALWAYS_ON config option that removes interpreter from the kernel in favor of JIT-only mode. This is now enabled by default in Mageia kernels.

Other security fixes in this update:

Linux kernel version 3.3-rc1 and later is affected by a vulnerability lies in the processing of incoming L2CAP commands - ConfigRequest, and ConfigResponse messages. This info leak is a result of uninitialized stack variables that may be returned to an attacker in their uninitialized state. By manipulating the code flows that precede the handling of these configuration messages, an attacker can also gain some control over which data will be held in the uninitialized stack variables. This can allow him to bypass KASLR, and stack canaries protection - as both pointers and stack canaries may be leaked in this manner (CVE-2017-1000410).

The dccpdisconnect function in net/dccp/proto.c in the Linux kernel through 4.14.3 allows local users to gain privileges or cause a denial of service (use-after-free) via an AFUNSPEC connect system call during the DCCP_LISTEN state (CVE-2017-8824).

WireGuard has been updated to 0.0.20180202

This update also fixes the rtl8812au driver that got broken/missing in the upgrade to 4.14 series kernels (mga#22524).

For other fixes in this update, read the referenced changelogs.