USN-3878-1: Linux kernel vulnerabilities
Publication date
4 February 2019
Overview
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm - Linux kernel for cloud environments
- linux-raspi2 - Linux kernel for Raspberry Pi 2
Details
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of...
It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)
Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)
Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)
It was discovered that the crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local attacker
could use this to expose sensitive information (kernel memory).
(CVE-2018-19854)
Update instructions
After a standard system update you need to reboot your computer to make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 18.10 cosmic | linux-image-kvm – 4.18.0.1007.7 | ||
| linux-image-gke – 4.18.0.1006.6 | |||
| linux-image-4.18.0-14-lowlatency – 4.18.0-14.15 | |||
| linux-image-4.18.0-14-snapdragon – 4.18.0-14.15 | |||
| linux-image-4.18.0-1007-kvm – 4.18.0-1007.7 | |||
| linux-image-generic – 4.18.0.14.15 | |||
| linux-image-gcp – 4.18.0.1006.6 | |||
| linux-image-4.18.0-14-generic – 4.18.0-14.15 | |||
| linux-image-4.18.0-1008-aws – 4.18.0-1008.10 | |||
| linux-image-aws – 4.18.0.1008.8 | |||
| linux-image-generic-lpae – 4.18.0.14.15 | |||
| linux-image-snapdragon – 4.18.0.14.15 | |||
| linux-image-4.18.0-1009-raspi2 – 4.18.0-1009.11 | |||
| linux-image-4.18.0-1006-gcp – 4.18.0-1006.7 | |||
| linux-image-4.18.0-14-generic-lpae – 4.18.0-14.15 | |||
| linux-image-lowlatency – 4.18.0.14.15 | |||
| linux-image-raspi2 – 4.18.0.1009.6 | |||
Reduce your security exposure
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References
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