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CVE-2017-12154

Status Candidate

Overview

The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.

Related Files

Kernel Live Patch Security Notice LSN-0032-1
Posted Nov 22, 2017
Authored by Benjamin M. Romer

Anthony Perard discovered that the Xen virtual block driver did not properly initialize some data structures before passing them to user space. A local attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs. Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this to cause a denial of service (system crash). It was discovered that the nested KVM implementation in the Linux kernel in some situations did not properly prevent second level guests from reading and writing the hardware CR8 register. A local attacker in a guest could use this to cause a denial of service (system crash). Otto Ebeling discovered that the memory manager in the Linux kernel did not properly check the effective UID in some situations. A local attacker could use this to expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-14140
MD5 | 1b9f090ee2c532a7a8474bdc057dd51d
Ubuntu Security Notice USN-3487-1
Posted Nov 22, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3487-1 - It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service or possibly execute arbitrary code in the host OS. It was discovered that on the PowerPC architecture, the kernel did not properly sanitize the signal stack when handling sigreturn. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000255, CVE-2017-12153, CVE-2017-12154, CVE-2017-12188, CVE-2017-12190, CVE-2017-12192, CVE-2017-14156, CVE-2017-14489, CVE-2017-14954, CVE-2017-15265, CVE-2017-15537, CVE-2017-15649, CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529, CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534
MD5 | 7ad11b332e12a1efd657b9f496e49a87
Ubuntu Security Notice USN-3469-1
Posted Oct 31, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3469-1 - Anthony Perard discovered that the Xen virtual block driver did not properly initialize some data structures before passing them to user space. A local attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs. Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-12192, CVE-2017-14051, CVE-2017-14156, CVE-2017-14340, CVE-2017-14489, CVE-2017-14991, CVE-2017-15537, CVE-2017-9984, CVE-2017-9985
MD5 | 7be1da2f9c2f1afabff5768836358115
Ubuntu Security Notice USN-3469-2
Posted Oct 31, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3469-2 - USN-3469-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Anthony Perard discovered that the Xen virtual block driver did not properly initialize some data structures before passing them to user space. A local attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-12192, CVE-2017-14051, CVE-2017-14156, CVE-2017-14340, CVE-2017-14489, CVE-2017-14991, CVE-2017-15537, CVE-2017-9984, CVE-2017-9985
MD5 | ee069ba6ad2d7d27d564a4fb060eba00
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