Packages
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
- linux-dell300x - Linux kernel for Dell 300x platforms
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe - Linux hardware enablement (HWE) kernel
- linux-kvm - Linux kernel for cloud environments
- linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
- linux-oracle - Linux kernel for Oracle Cloud systems
- linux-raspi2 - Linux kernel for Raspberry Pi systems
- linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Enrico Barberis, Pietro Frigo, Marius Muench, Herbert Bos, and Cristiano
Giuffrida discovered that hardware mitigations added by Intel to their
processors to address Spectre-BTI were insufficient. A local attacker could
potentially use this to expose sensitive information.
Enrico Barberis, Pietro Frigo, Marius Muench, Herbert Bos, and Cristiano
Giuffrida discovered that hardware mitigations added by Intel to their
processors to address Spectre-BTI were insufficient. A local attacker could
potentially use this to expose sensitive information.
Update instructions
IMPORTANT: As part of this update, unprivileged eBPF is being disabled by default, as it is the primary known means of exploiting the Branch History Injection issues described above. It should be noted that other mechanisms for exploiting the underlying issues may be discovered. Also, this may cause issues for applications that rely on the unprivileged eBPF functionality. Please see the knowledge base article at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/BHI for more details. 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:
Reduce your security exposure
Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.