Important kernel security update: CVE-2018-1068; Virtuozzo ReadyKernel patch 47.0 for Virtuozzo 7.0.7¶

1. Overview¶

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to the Virtuozzo 7.0 kernel 3.10.0-693.17.1.vz7.43.10 (7.0.7).

2. Security Fixes¶

• [Important] It was discovered that the implementation of ebtables in the kernel did not properly validate the offsets received from the user space. A local user with enough privileges in the user and network namespaces could use that to trigger an out-of-bounds write to the kernel address space. (CVE-2018-1068)

3. Bug Fixes¶

• Potential kernel hang (endless loop) in try_charge(). (PSBM-81939)

• The fix for a race in tcache inadvertently broke tcache invalidation, leading to kernel warnings in tcache_invalidate_node_pages() among other things. (PSBM-81940)

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-43.10-47.0-1.vl7/

• https://access.redhat.com/security/cve/CVE-2018-1068

The JSON file with the list of new and updated packages is available at http://docs.virtuozzo.com/vza/VZA-2018-015.json.