Kernel security update: CVE-2017-7645 and other; new kernel 2.6.32-042stab123.3 for Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0¶
Issue date: 2017-05-11
Applies to: Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0
Virtuozzo Advisory ID: VZA-2017-036
This update provides a new kernel 2.6.32-042stab123.3 for Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0. The new kernel is based on the Red Hat Enterprise Linux 6.9 kernel 2.6.32-696.el6 and provides security fixes as well as stability bug fixes.
2. Security Fixes¶
[Important] The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lack certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly have unspecified other impact via crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895)
[Important] The NFSv2/NFSv3 server in the nfsd subsystem in the Linux kernel through 4.10.11 allowed remote attackers to cause a denial of service (system crash) via a long RPC reply, related to net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c. (CVE-2017-7645)
3. Bug Fixes¶
Node with containers running over an NFS share could crash during container resize operations. A degradation in 042stab123.x kernels. (PSBM-65555)
Under certain rare conditions, if host resources were lacking, starting a container with NFS support could crash the host. All 042stab kernels were affected. (PSBM-65550)
4. Installing the Update¶
Install the update with the ‘vzup2date’ utility included in the distribution.
The JSON file with the list of new and updated packages is available at http://docs.virtuozzo.com/vza/VZA-2017-036.json.