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AUSCERT External Security Bulletin Redistribution
ESB-2020.1216
USN-4318-1: Linux kernel vulnerabilities
7 April 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8992 CVE-2020-8834 CVE-2020-8428
CVE-2019-19046
Reference: ESB-2020.0949
ESB-2020.0925
ESB-2020.0920
ESB-2020.0908
Original Bulletin:
https://usn.ubuntu.com/4318-1/
https://usn.ubuntu.com/4319-1/
https://usn.ubuntu.com/4320-1/
Comment: This bulletin contains three (3) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4318-1: Linux kernel vulnerabilities
6 April 2020
linux, linux-hwe vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
o linux-hwe - Linux hardware enablement (HWE) kernel
Details
Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly expose sensitive information (kernel
memory). (CVE-2020-8428)
Gustavo Romero and Paul Mackerras discovered that the KVM implementation in the
Linux kernel for PowerPC processors did not properly keep guest state separate
from host state. A local attacker in a KVM guest could use this to cause a
denial of service (host system crash). (CVE-2020-8834)
Shijie Luo discovered that the ext4 file system implementation in the Linux
kernel did not properly check for a too-large journal size. An attacker could
use this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (soft lockup). (CVE-2020-8992)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-96-generic - 4.15.0-96.97
linux-image-4.15.0-96-generic-lpae - 4.15.0-96.97
linux-image-4.15.0-96-lowlatency - 4.15.0-96.97
linux-image-generic - 4.15.0.96.87
linux-image-generic-lpae - 4.15.0.96.87
linux-image-lowlatency - 4.15.0.96.87
linux-image-powerpc-e500mc - 4.15.0.96.87
linux-image-powerpc-smp - 4.15.0.96.87
linux-image-powerpc64-emb - 4.15.0.96.87
linux-image-powerpc64-smp - 4.15.0.96.87
linux-image-virtual - 4.15.0.96.87
Ubuntu 16.04 LTS
linux-image-4.15.0-96-generic - 4.15.0-96.97~16.04.1
linux-image-4.15.0-96-generic-lpae - 4.15.0-96.97~16.04.1
linux-image-4.15.0-96-lowlatency - 4.15.0-96.97~16.04.1
linux-image-generic-hwe-16.04 - 4.15.0.96.104
linux-image-generic-lpae-hwe-16.04 - 4.15.0.96.104
linux-image-lowlatency-hwe-16.04 - 4.15.0.96.104
linux-image-oem - 4.15.0.96.104
linux-image-virtual-hwe-16.04 - 4.15.0.96.104
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
o CVE-2020-8428
o CVE-2020-8834
o CVE-2020-8992
- --------------------------------------------------------------------------------
USN-4319-1: Linux kernel vulnerabilities
6 April 2020
linux, linux-aws, linux-gcp, linux-gcp-5.3, linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2, linux-raspi2-5.3 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi2 - Linux kernel for Raspberry Pi 2
o linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
o linux-oracle-5.3 - Linux kernel Oracle Cloud systems
o linux-raspi2-5.3 - Linux kernel for Raspberry Pi 2
Details
It was discovered that the IPMI message handler implementation in the Linux
kernel did not properly deallocate memory in certain situations. A local
attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19046)
Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly expose sensitive information (kernel
memory). (CVE-2020-8428)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.10
linux-image-5.3.0-1014-oracle - 5.3.0-1014.15
linux-image-5.3.0-1015-kvm - 5.3.0-1015.16
linux-image-5.3.0-1016-aws - 5.3.0-1016.17
linux-image-5.3.0-1017-gcp - 5.3.0-1017.18
linux-image-5.3.0-1022-raspi2 - 5.3.0-1022.24
linux-image-5.3.0-46-generic - 5.3.0-46.38
linux-image-5.3.0-46-generic-lpae - 5.3.0-46.38
linux-image-5.3.0-46-lowlatency - 5.3.0-46.38
linux-image-5.3.0-46-snapdragon - 5.3.0-46.38
linux-image-aws - 5.3.0.1016.18
linux-image-gcp - 5.3.0.1017.18
linux-image-generic - 5.3.0.46.39
linux-image-generic-lpae - 5.3.0.46.39
linux-image-gke - 5.3.0.1017.18
linux-image-kvm - 5.3.0.1015.17
linux-image-lowlatency - 5.3.0.46.39
linux-image-oracle - 5.3.0.1014.15
linux-image-raspi2 - 5.3.0.1022.19
linux-image-snapdragon - 5.3.0.46.39
linux-image-virtual - 5.3.0.46.39
Ubuntu 18.04 LTS
linux-image-5.3.0-1014-oracle - 5.3.0-1014.15~18.04.1
linux-image-5.3.0-1017-gcp - 5.3.0-1017.18~18.04.1
linux-image-5.3.0-1022-raspi2 - 5.3.0-1022.24~18.04.1
linux-image-5.3.0-46-generic - 5.3.0-46.38~18.04.1
linux-image-5.3.0-46-generic-lpae - 5.3.0-46.38~18.04.1
linux-image-5.3.0-46-lowlatency - 5.3.0-46.38~18.04.1
linux-image-gcp-edge - 5.3.0.1017.16
linux-image-generic-hwe-18.04 - 5.3.0.46.102
linux-image-generic-lpae-hwe-18.04 - 5.3.0.46.102
linux-image-lowlatency-hwe-18.04 - 5.3.0.46.102
linux-image-oracle-edge - 5.3.0.1014.13
linux-image-raspi2-hwe-18.04 - 5.3.0.1022.11
linux-image-snapdragon-hwe-18.04 - 5.3.0.46.102
linux-image-virtual-hwe-18.04 - 5.3.0.46.102
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
o CVE-2019-19046
o CVE-2020-8428
- --------------------------------------------------------------------------------
USN-4320-1: Linux kernel vulnerability
6 April 2020
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Summary
The system could be made to crash or expose sensitive information.
Software Description
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-kvm - Linux kernel for cloud environments
o linux-raspi2 - Linux kernel for Raspberry Pi 2
o linux-snapdragon - Linux kernel for Snapdragon processors
o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
Details
Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly expose sensitive information (kernel
memory).
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04 LTS
linux-image-4.4.0-1069-kvm - 4.4.0-1069.76
linux-image-4.4.0-1105-aws - 4.4.0-1105.116
linux-image-4.4.0-1131-raspi2 - 4.4.0-1131.140
linux-image-4.4.0-1135-snapdragon - 4.4.0-1135.143
linux-image-4.4.0-177-generic - 4.4.0-177.207
linux-image-4.4.0-177-generic-lpae - 4.4.0-177.207
linux-image-4.4.0-177-lowlatency - 4.4.0-177.207
linux-image-4.4.0-177-powerpc-e500mc - 4.4.0-177.207
linux-image-4.4.0-177-powerpc-smp - 4.4.0-177.207
linux-image-4.4.0-177-powerpc64-emb - 4.4.0-177.207
linux-image-4.4.0-177-powerpc64-smp - 4.4.0-177.207
linux-image-aws - 4.4.0.1105.109
linux-image-generic - 4.4.0.177.185
linux-image-generic-lpae - 4.4.0.177.185
linux-image-kvm - 4.4.0.1069.69
linux-image-lowlatency - 4.4.0.177.185
linux-image-powerpc-e500mc - 4.4.0.177.185
linux-image-powerpc-smp - 4.4.0.177.185
linux-image-powerpc64-emb - 4.4.0.177.185
linux-image-powerpc64-smp - 4.4.0.177.185
linux-image-raspi2 - 4.4.0.1131.131
linux-image-snapdragon - 4.4.0.1135.127
linux-image-virtual - 4.4.0.177.185
Ubuntu 14.04 ESM
linux-image-4.4.0-1065-aws - 4.4.0-1065.69
linux-image-4.4.0-177-generic - 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-generic-lpae - 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-lowlatency - 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc-e500mc - 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc-smp - 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc64-emb - 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc64-smp - 4.4.0-177.207~14.04.1
linux-image-aws - 4.4.0.1065.66
linux-image-generic-lpae-lts-xenial - 4.4.0.177.156
linux-image-generic-lts-xenial - 4.4.0.177.156
linux-image-lowlatency-lts-xenial - 4.4.0.177.156
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.177.156
linux-image-powerpc-smp-lts-xenial - 4.4.0.177.156
linux-image-powerpc64-emb-lts-xenial - 4.4.0.177.156
linux-image-powerpc64-smp-lts-xenial - 4.4.0.177.156
linux-image-virtual-lts-xenial - 4.4.0.177.156
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
o CVE-2020-8428
- --------------------------END INCLUDED TEXT--------------------
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