LSN-0069-1: Kernel Live Patch Security Notice
27 July 2020
Several security issues were fixed in the kernel.
Releases
Software Description
- aws - Linux kernel for Amazon Web Services (AWS) systems - (>= 4.15.0-1054, >= 5.4.0-1009, >= 4.4.0-1098)
- azure - Linux kernel for Microsoft Azure Cloud systems - (>= 5.4.0-1010)
- gcp - Linux kernel for Google Cloud Platform (GCP) systems - (>= 5.4.0-1009)
- generic-4.15 - Linux kernel - (>= 4.15.0-69)
- generic-4.4 - Linux kernel - (>= 4.4.0-168)
- generic-5.4 - Linux kernel - (>= 5.4.0-26)
- lowlatency-4.15 - Linux kernel - (>= 4.15.0-69)
- lowlatency-4.4 - Linux kernel - (>= 4.4.0-168)
- lowlatency-5.4 - Linux kernel - (>= 5.4.0-26)
- oem - Linux kernel for OEM systems - (>= 4.15.0-1063)
Details
Relay_open in kernel/relay.c in the Linux kernel through 5.4.1 allows local
users to cause a denial of service (such as relay blockage) by triggering a
NULL alloc_percpu result. (CVE-2019-19462)
Fan Yang discovered that the mremap implementation in the Linux kernel did
not properly handle DAX Huge Pages. A local attacker with access to DAX
storage could use this to gain administrative privileges. (CVE-2020-10757)
It was discovered that the DesignWare SPI controller driver in the Linux
kernel contained a race condition. A local attacker could possibly use this
to cause a denial of service (system crash). (CVE-2020-12769)
In the Linux kernel before 5.4.16, a race condition in tty->disc_data
handling in the slip and slcan line discipline could lead to a
use-after-free, aka CID-0ace17d56824. This affects drivers/net/slip/slip.c
and drivers/net/can/slcan.c. (CVE-2020-14416)
Checking update status
The problem can be corrected in these Livepatch versions:
| Kernel type | 20.04 | 18.04 | 16.04 |
|---|---|---|---|
| aws | 69.1 | 69.1 | 69.1 |
| azure | 69.1 | — | — |
| gcp | 69.1 | — | — |
| generic-4.15 | — | 69.1 | — |
| generic-4.4 | — | — | 69.1 |
| generic-5.4 | 69.1 | — | — |
| lowlatency-4.15 | — | 69.1 | — |
| lowlatency-4.4 | — | — | 69.1 |
| lowlatency-5.4 | 69.1 | — | — |
| oem | — | 69.1 | — |
To check your kernel type and Livepatch version, enter this command:
canonical-livepatch status