Ubuntu 4950-1: Linux kernel vulnerabilities | LinuxSecurity.com
==========================================================================
Ubuntu Security Notice USN-4950-1
May 11, 2021

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle,
linux-raspi vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- 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-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi (V8) systems

Details:

Ryota Shiga discovered that the eBPF implementation in the Linux kernel did
not properly verify that a BPF program only reserved as much memory for a
ring buffer as was allocated. A local attacker could use this to cause a
denial of service (system crash) or execute arbitrary code. (CVE-2021-3489)

Manfred Paul discovered that the eBPF implementation in the Linux kernel
did not properly track bounds on bitwise operations. A local attacker could
use this to cause a denial of service (system crash) or execute arbitrary
code. (CVE-2021-3490)

Billy Jheng Bing-Jhong discovered that the io_uring implementation of the
Linux kernel did not properly enforce the MAX_RW_COUNT limit in some
situations. A local attacker could use this to cause a denial of service
(system crash) or execute arbitrary code. (CVE-2021-3491)

Norbert Slusarek discovered that the CAN ISOTP protocol implementation
in the Linux kernel contained a race condition. A local attacker could
use this to cause a denial of service (system crash) or possibly
execute arbitrary code. Please note that to address this issue,
SF_BROADCAST support was removed temporarily from the CAN ISOTP
implementation in Ubuntu 21.04 kernels. (LP: #1927409)

Update instructions:

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

Ubuntu 21.04:
  linux-image-5.11.0-1005-azure   5.11.0-1005.5
  linux-image-5.11.0-1006-oracle  5.11.0-1006.6
  linux-image-5.11.0-1007-aws     5.11.0-1007.7
  linux-image-5.11.0-1007-gcp     5.11.0-1007.7
  linux-image-5.11.0-1007-kvm     5.11.0-1007.7
  linux-image-5.11.0-1008-raspi   5.11.0-1008.8
  linux-image-5.11.0-1008-raspi-nolpae  5.11.0-1008.8
  linux-image-5.11.0-17-generic   5.11.0-17.18
  linux-image-5.11.0-17-generic-64k  5.11.0-17.18
  linux-image-5.11.0-17-generic-lpae  5.11.0-17.18
  linux-image-5.11.0-17-lowlatency  5.11.0-17.18
  linux-image-aws                 5.11.0.1007.7
  linux-image-azure               5.11.0.1005.5
  linux-image-gcp                 5.11.0.1007.7
  linux-image-generic             5.11.0.17.18
  linux-image-generic-64k         5.11.0.17.18
  linux-image-generic-lpae        5.11.0.17.18
  linux-image-gke                 5.11.0.1007.7
  linux-image-kvm                 5.11.0.1007.7
  linux-image-lowlatency          5.11.0.17.18
  linux-image-oracle              5.11.0.1006.6
  linux-image-raspi               5.11.0.1008.6
  linux-image-raspi-nolpae        5.11.0.1008.6
  linux-image-virtual             5.11.0.17.18

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-4950-1
  CVE-2021-3489, CVE-2021-3490, CVE-2021-3491, https://launchpad.net/bugs/1927409

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.11.0-17.18
  https://launchpad.net/ubuntu/+source/linux-aws/5.11.0-1007.7
  https://launchpad.net/ubuntu/+source/linux-azure/5.11.0-1005.5
  https://launchpad.net/ubuntu/+source/linux-gcp/5.11.0-1007.7
  https://launchpad.net/ubuntu/+source/linux-kvm/5.11.0-1007.7
  https://launchpad.net/ubuntu/+source/linux-oracle/5.11.0-1006.6
  https://launchpad.net/ubuntu/+source/linux-raspi/5.11.0-1008.8

Ubuntu 4950-1: Linux kernel vulnerabilities

May 11, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - 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-oracle: Linux kernel for Oracle Cloud systems - linux-raspi: Linux kernel for Raspberry Pi (V8) systems Details: Ryota Shiga discovered that the eBPF implementation in the Linux kernel did not properly verify that a BPF program only reserved as much memory for a ring buffer as was allocated. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3489) Manfred Paul discovered that the eBPF implementation in the Linux kernel did not properly track bounds on bitwise operations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3490) Billy Jheng Bing-Jhong discovered that the io_uring implementation of the Linux kernel did not properly enforce the MAX_RW_COUNT limit in some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3491) Norbert Slusarek discovered that the CAN ISOTP protocol implementation in the Linux kernel contained a race condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Please note that to address this issue, SF_BROADCAST support was removed temporarily from the CAN ISOTP implementation in Ubuntu 21.04 kernels. (LP: #1927409)

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: linux-image-5.11.0-1005-azure 5.11.0-1005.5 linux-image-5.11.0-1006-oracle 5.11.0-1006.6 linux-image-5.11.0-1007-aws 5.11.0-1007.7 linux-image-5.11.0-1007-gcp 5.11.0-1007.7 linux-image-5.11.0-1007-kvm 5.11.0-1007.7 linux-image-5.11.0-1008-raspi 5.11.0-1008.8 linux-image-5.11.0-1008-raspi-nolpae 5.11.0-1008.8 linux-image-5.11.0-17-generic 5.11.0-17.18 linux-image-5.11.0-17-generic-64k 5.11.0-17.18 linux-image-5.11.0-17-generic-lpae 5.11.0-17.18 linux-image-5.11.0-17-lowlatency 5.11.0-17.18 linux-image-aws 5.11.0.1007.7 linux-image-azure 5.11.0.1005.5 linux-image-gcp 5.11.0.1007.7 linux-image-generic 5.11.0.17.18 linux-image-generic-64k 5.11.0.17.18 linux-image-generic-lpae 5.11.0.17.18 linux-image-gke 5.11.0.1007.7 linux-image-kvm 5.11.0.1007.7 linux-image-lowlatency 5.11.0.17.18 linux-image-oracle 5.11.0.1006.6 linux-image-raspi 5.11.0.1008.6 linux-image-raspi-nolpae 5.11.0.1008.6 linux-image-virtual 5.11.0.17.18 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-4950-1

CVE-2021-3489, CVE-2021-3490, CVE-2021-3491, https://launchpad.net/bugs/1927409

Severity
Ubuntu Security Notice USN-4950-1

Package Information

https://launchpad.net/ubuntu/+source/linux/5.11.0-17.18 https://launchpad.net/ubuntu/+source/linux-aws/5.11.0-1007.7 https://launchpad.net/ubuntu/+source/linux-azure/5.11.0-1005.5 https://launchpad.net/ubuntu/+source/linux-gcp/5.11.0-1007.7 https://launchpad.net/ubuntu/+source/linux-kvm/5.11.0-1007.7 https://launchpad.net/ubuntu/+source/linux-oracle/5.11.0-1006.6 https://launchpad.net/ubuntu/+source/linux-raspi/5.11.0-1008.8

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