USN-4093-1: Linux kernel vulnerabilities
linux, linux-hwe, linux-azure, linux-gcp, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.04
- Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
- linux – Linux kernel
- linux-azure – Linux kernel for Microsoft Azure Cloud 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
- linux-snapdragon – Linux kernel for Snapdragon processors
- linux-hwe – Linux hardware enablement (HWE) kernel
Details
It was discovered that a heap buffer overflow existed in the Marvell
Wireless LAN device driver for the Linux kernel. An attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2019-10126)
Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors
incorrectly handle SWAPGS instructions during speculative execution. A
local attacker could use this to expose sensitive information (kernel
memory). (CVE-2019-1125)
It was discovered that the PowerPC dlpar implementation in the Linux kernel
did not properly check for allocation errors in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-12614)
It was discovered that a NULL pointer dereference vulnerability existed in
the Near-field communication (NFC) implementation in the Linux kernel. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2019-12984)
Jann Horn discovered a use-after-free vulnerability in the Linux kernel
when accessing LDT entries in some situations. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-13233)
Jann Horn discovered that the ptrace implementation in the Linux kernel did
not properly record credentials in some situations. A local attacker could
use this to cause a denial of service (system crash) or possibly gain
administrative privileges. (CVE-2019-13272)
It was discovered that the Marvell Wireless LAN device driver in the Linux
kernel did not properly validate the BSS descriptor. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-3846)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 19.04
- linux-image-5.0.0-1013-gcp – 5.0.0-1013.13
- linux-image-5.0.0-1013-kvm – 5.0.0-1013.14
- linux-image-5.0.0-1014-azure – 5.0.0-1014.14
- linux-image-5.0.0-1014-raspi2 – 5.0.0-1014.14
- linux-image-5.0.0-1018-snapdragon – 5.0.0-1018.19
- linux-image-5.0.0-25-generic – 5.0.0-25.26
- linux-image-5.0.0-25-generic-lpae – 5.0.0-25.26
- linux-image-5.0.0-25-lowlatency – 5.0.0-25.26
- linux-image-azure – 5.0.0.1014.13
- linux-image-gcp – 5.0.0.1013.13
- linux-image-generic – 5.0.0.25.26
- linux-image-generic-lpae – 5.0.0.25.26
- linux-image-gke – 5.0.0.1013.13
- linux-image-kvm – 5.0.0.1013.13
- linux-image-lowlatency – 5.0.0.25.26
- linux-image-raspi2 – 5.0.0.1014.11
- linux-image-snapdragon – 5.0.0.1018.11
- linux-image-virtual – 5.0.0.25.26
- Ubuntu 18.04 LTS
- linux-image-5.0.0-1014-azure – 5.0.0-1014.14~18.04.1
- linux-image-5.0.0-25-generic – 5.0.0-25.26~18.04.1
- linux-image-5.0.0-25-generic-lpae – 5.0.0-25.26~18.04.1
- linux-image-5.0.0-25-lowlatency – 5.0.0-25.26~18.04.1
- linux-image-azure – 5.0.0.1014.25
- linux-image-generic-hwe-18.04 – 5.0.0.25.82
- linux-image-generic-lpae-hwe-18.04 – 5.0.0.25.82
- linux-image-lowlatency-hwe-18.04 – 5.0.0.25.82
- linux-image-snapdragon-hwe-18.04 – 5.0.0.25.82
- linux-image-virtual-hwe-18.04 – 5.0.0.25.82
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
- CVE-2019-10126
- CVE-2019-1125
- CVE-2019-12614
- CVE-2019-12984
- CVE-2019-13233
- CVE-2019-13272
- CVE-2019-3846
Source: USN-4093-1: Linux kernel vulnerabilities
