Kernel security update: CVE-2017-7542 and other; Virtuozzo ReadyKernel patch 27.0 for Virtuozzo 7.0.5¶

1. Overview¶

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to Virtuozzo kernels 3.10.0-514.26.1.vz7.33.22 (Virtuozzo 7.0.5).

2. Security Fixes¶

• [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¶

• Kernel crash in rpc_abort_task() in certain conditions. (PSBM-69434)

4. Installing the Update¶

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

5. References¶

• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-33.22-27.0-1.vl7/

• https://access.redhat.com/security/cve/CVE-2017-CVE-2017-7542

• https://access.redhat.com/security/cve/CVE-2017-CVE-2017-7541

The JSON file with the list of new and updated packages is available at http://docs.virtuozzo.com/vza/VZA-2017-069.json.