LSN-0077-1: Kernel Live Patch Security Notice
17 May 2021
Several security issues were fixed in the kernel.
Releases
Software Description
- gcp - Linux kernel for Google Cloud Platform (GCP) systems - (>= 5.4.0-1009)
- generic-5.4 - Linux kernel - (>= 5.4.0-26, >= 5.4.0-26)
- gke - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1033)
- gke-5.4 - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1009)
- gkeop - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1009)
- gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1007)
- lowlatency-5.4 - Linux kernel - (>= 5.4.0-26, >= 5.4.0-26)
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)
Checking update status
The problem can be corrected in these Livepatch versions:
| Kernel type | 20.04 | 18.04 |
|---|---|---|
| gcp | 77.1 | — |
| generic-5.4 | 77.1 | 77.1 |
| gke | 77.1 | — |
| gke-5.4 | — | 77.1 |
| gkeop | 77.1 | — |
| gkeop-5.4 | — | 77.1 |
| lowlatency-5.4 | 77.1 | 77.1 |
To check your kernel type and Livepatch version, enter this command:
canonical-livepatch status