Kernel security update: CVE-2017-11600 and other; Virtuozzo ReadyKernel patch 27.2 for Virtuozzo 7.0.0, 7.0.1, and 7.0.3

Issue date: 2017-08-04

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2017-067

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to Virtuozzo kernels 3.10.0-327.18.2.vz7.15.2 (Virtuozzo 7.0.0), 3.10.0-327.36.1.vz7.18.7 (Virtuozzo 7.0.1), and 3.10.0-327.36.1.vz7.20.18 (Virtuozzo 7.0.3).

2. Security Fixes

  • [Moderate] A vulnerability was found in the handling of xfrm Netlink messages. A privileged user inside a container could cause a denial of service (kernel crash) by sending a crafted Netlink message with type XFRM_MSG_MIGRATE to the kernel. (CVE-2017-11600)

  • [Moderate] Integer overflow vulnerability in ip6_find_1stfragopt() function was found. Local attacker that has privileges to open raw sockets can cause infinite loop inside ip6_find_1stfragopt() function. (CVE-2017-7542)

  • [Moderate] Kernel memory corruption due to a buffer overflow was found in brcmf_cfg80211_mgmt_tx() function in Linux kernels from v3.9-rc1 to v4.13-rc1. The vulnerability can be triggered by sending a crafted NL80211_CMD_FRAME packet via netlink. An unprivileged local user could use this flaw to induce kernel memory corruption on the system, leading to a crash. (CVE-2017-7541)

3. Bug Fixes

  • Division by zero in dcache_is_low(). (PSBM-69018)

  • It was discovered that lseek(SEEK_DATA) and lseek(SEEK_HOLE) returned incorrect values on ext4 filesystem in some cases, causing corruption of QCOW2 disk images used by VMs. (PSBM-68292)

4. Installing the Update

Download, install, and instantly apply the patch to the current kernel by running ‘readykernel update’.