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Ubuntu Security Notice USN-5116-2

Ubuntu Security Notice USN-5116-2
Posted Oct 22, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5116-2 - It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An attacker could possibly use this to expose sensitive information. Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information. It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly compute the access permissions for shadow pages in some situations. A local attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-3702, CVE-2021-3732, CVE-2021-38198, CVE-2021-38205, CVE-2021-40490, CVE-2021-42008
SHA-256 | bb413440af0aa8dceb1eaf38175be7d5c9ca2e29eb72383441a3801aa860047d

Ubuntu Security Notice USN-5116-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5116-2
October 22, 2021

linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gke,
linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-oracle,
linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities
==========================================================================

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 Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4: Linux kernel version specific cloud tools for version 5.4.0-1062
- linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

It was discovered that a race condition existed in the Atheros Ath9k WiFi
driver in the Linux kernel. An attacker could possibly use this to expose
sensitive information (WiFi network traffic). (CVE-2020-3702)

Alois Wohlschlager discovered that the overlay file system in the Linux
kernel did not restrict private clones in some situations. An attacker
could use this to expose sensitive information. (CVE-2021-3732)

It was discovered that the KVM hypervisor implementation in the Linux
kernel did not properly compute the access permissions for shadow pages in
some situations. A local attacker could use this to cause a denial of
service. (CVE-2021-38198)

It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the
Linux kernel could report pointer addresses in some situations. An attacker
could use this information to ease the exploitation of another
vulnerability. (CVE-2021-38205)

It was discovered that the ext4 file system in the Linux kernel contained a
race condition when writing xattrs to an inode. A local attacker could use
this to cause a denial of service or possibly gain administrative
privileges. (CVE-2021-40490)

It was discovered that the 6pack network protocol driver in the Linux
kernel did not properly perform validation checks. A privileged attacker
could use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2021-42008)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
linux-image-5.4.0-1025-gkeop 5.4.0-1025.26
linux-image-5.4.0-1045-raspi 5.4.0-1045.49
linux-image-5.4.0-1054-gke 5.4.0-1054.57
linux-image-5.4.0-1056-oracle 5.4.0-1056.60
linux-image-5.4.0-1058-aws 5.4.0-1058.61
linux-image-5.4.0-1062-azure 5.4.0-1062.65
linux-image-aws-lts-20.04 5.4.0.1058.61
linux-image-azure-lts-20.04 5.4.0.1062.60
linux-image-gke 5.4.0.1054.64
linux-image-gke-5.4 5.4.0.1054.64
linux-image-gkeop 5.4.0.1025.28
linux-image-gkeop-5.4 5.4.0.1025.28
linux-image-oracle-lts-20.04 5.4.0.1056.56
linux-image-raspi 5.4.0.1045.80
linux-image-raspi2 5.4.0.1045.80

Ubuntu 18.04 LTS:
linux-image-5.4.0-1025-gkeop 5.4.0-1025.26~18.04.1
linux-image-5.4.0-1045-raspi 5.4.0-1045.49~18.04.1
linux-image-5.4.0-1054-gke 5.4.0-1054.57~18.04.1
linux-image-5.4.0-1056-oracle 5.4.0-1056.60~18.04.1
linux-image-5.4.0-1058-aws 5.4.0-1058.61~18.04.3
linux-image-5.4.0-1062-azure 5.4.0-1062.65~18.04.1
linux-image-aws 5.4.0.1058.41
linux-image-azure 5.4.0.1062.42
linux-image-gke-5.4 5.4.0.1054.57~18.04.19
linux-image-gkeop-5.4 5.4.0.1025.26~18.04.26
linux-image-oracle 5.4.0.1056.60~18.04.36
linux-image-raspi-hwe-18.04 5.4.0.1045.48

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:
https://ubuntu.com/security/notices/USN-5116-2
https://ubuntu.com/security/notices/USN-5116-1
CVE-2020-3702, CVE-2021-3732, CVE-2021-38198, CVE-2021-38205,
CVE-2021-40490, CVE-2021-42008

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1058.61
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1062.65
https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1054.57
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1025.26
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1056.60
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1045.49
https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1058.61~18.04.3
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1062.65~18.04.1
https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1054.57~18.04.1
https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1025.26~18.04.1
https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1056.60~18.04.1
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1045.49~18.04.1

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