A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the kernel.
Software Description
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS)
systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP)
systems
- linux-gke - Linux kernel for Google Container Engine (GKE)
systems
- linux-gkeop - Linux kernel for Google Container Engine (GKE)
systems
Details
Vincent Dehors discovered that the shiftfs file system in the
Ubuntu
Linux kernel did not properly handle faults in copy_from_user()
when
passing through ioctls to an underlying file system. A local
attacker
could use this to cause a denial of service (memory exhaustion)
or
execute arbitrary code. (CVE-2021-3492)
Update instructions
The problem can be corrected by updating your kernel livepatch
to the
following versions:
Ubuntu 20.04 LTS
aws - 77.1
azure - 77.1
gcp - 77.1
generic - 77.1
gke - 77.1
gkeop - 77.1
lowlatency - 77.1
Ubuntu 18.04 LTS
generic - 77.1
gke - 77.1
gkeop - 77.1
lowlatency - 77.1
Support Information
Kernels older than the levels listed below do not receive
livepatch
updates. If you are running a kernel version earlier than the
one
listed
below, please upgrade your kernel as soon as possible.
Ubuntu 20.04 LTS
linux-aws - 5.4.0-1009
linux-azure - 5.4.0-1010
linux-gcp - 5.4.0-1009
linux-gke - 5.4.0-1033
linux-gkeop - 5.4.0-1009
linux-oem - 5.4.0-26
linux - 5.4.0-26
Ubuntu 18.04 LTS
linux-aws-fips - 4.15.0-2030
linux-aws - 4.15.0-1054
linux-azure-fips - 4.15.0-2012
linux-fips - 4.15.0-1045
linux-gke-4.15 - 4.15.0-1076
linux-gke-5.4 - 5.4.0-1009
linux-gkeop-5.4 - 5.4.0-1007
linux-hwe-5.4 - 5.4.0-26
linux-oem - 4.15.0-1063
linux - 4.15.0-69
Ubuntu 16.04 LTS
linux-aws - 4.4.0-1098
linux-azure - 4.15.0-1063
linux-azure - 4.15.0-1078
linux-fips - 4.4.0-1049
linux-hwe - 4.15.0-69
linux - 4.4.0-168
Ubuntu 14.04 ESM
linux-lts-xenial - 4.4.0-168
References
- CVE-2021-3492
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