USN-5130-1: Linux kernel vulnerabilities

Releases

• Ubuntu 14.04 ESM

Packages

• linux - Linux kernel

Details

Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-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-2020-29660)

Update instructions

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

Ubuntu 14.04

• linux-image-3.13.0-188-generic - 3.13.0-188.239
  Available with Ubuntu Pro
• linux-image-3.13.0-188-lowlatency - 3.13.0-188.239
  Available with Ubuntu Pro
• linux-image-generic - 3.13.0.188.197
  Available with Ubuntu Pro
• linux-image-lowlatency - 3.13.0.188.197
  Available with Ubuntu Pro
• linux-image-server - 3.13.0.188.197
  Available with Ubuntu Pro
• linux-image-virtual - 3.13.0.188.197
  Available with Ubuntu Pro

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-2020-29660
• CVE-2020-29661

Related notices

• USN-4748-1: linux-raspi2, linux-image-lowlatency-lts-xenial, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-utopic, linux-image-kvm, linux-image-4.4.0-203-powerpc-smp, linux-image-virtual-lts-xenial, linux-image-4.4.0-203-powerpc64-smp, linux-image-snapdragon, linux-image-4.4.0-1150-snapdragon, linux-image-powerpc64-smp-lts-wily, linux-image-generic-lts-vivid, linux-image-lowlatency, linux-aws, linux-image-virtual-lts-wily, linux-image-4.4.0-203-powerpc-e500mc, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-smp-lts-xenial, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-203-generic, linux-image-virtual-lts-utopic, linux-image-powerpc64-emb, linux-image-4.4.0-1088-kvm, linux-image-aws, linux-kvm, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-vivid, linux-image-4.4.0-1122-aws, linux-lts-xenial, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc-e500mc-lts-vivid, linux-image-4.4.0-203-generic-lpae, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-smp-lts-utopic, linux-image-generic-lts-wily, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc64-smp, linux-image-virtual, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-xenial, linux-image-lowlatency-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lts-xenial, linux-image-raspi2, linux-image-generic-lpae, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-vivid, linux-image-4.4.0-203-lowlatency, linux-image-4.4.0-203-powerpc64-emb, linux-image-generic, linux-image-4.4.0-1086-aws, linux-snapdragon, linux, linux-image-4.4.0-1146-raspi2, linux-image-powerpc64-emb-lts-wily
• USN-4749-1: linux-raspi2, linux-dell300x, linux-image-kvm, linux-image-gke, linux-image-4.15.0-1065-oracle, linux-image-4.15.0-1094-aws, linux-gcp, linux-azure-4.15, linux-image-snapdragon, linux-image-4.15.0-1079-gke, linux-image-aws-hwe, linux-image-lowlatency, linux-aws, linux-oracle, linux-image-gcp-lts-18.04, linux, linux-gcp-4.15, linux-aws-hwe, linux-image-4.15.0-1093-gcp, linux-image-4.15.0-1079-raspi2, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1085-kvm, linux-image-4.15.0-136-generic, linux-image-azure, linux-image-oracle, linux-image-4.15.0-136-generic-lpae, linux-image-azure-edge, linux-gke-4.15, linux-kvm, linux-image-gke-4.15, linux-image-oracle-lts-18.04, linux-image-virtual, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1096-snapdragon, linux-image-lowlatency-hwe-16.04, linux-image-dell300x, linux-image-gcp, linux-image-generic-hwe-16.04, linux-image-oem, linux-image-generic-hwe-16.04-edge, linux-image-generic-lpae, linux-image-4.15.0-1108-azure, linux-image-4.15.0-1012-dell300x, linux-image-generic-lpae-hwe-16.04-edge, linux-image-raspi2, linux-image-virtual-hwe-16.04, linux-image-generic, linux-image-aws-lts-18.04, linux-image-virtual-hwe-16.04-edge, linux-image-azure-lts-18.04, linux-snapdragon, linux-hwe, linux-image-4.15.0-136-lowlatency, linux-azure
• USN-4750-1: linux-azure-5.4, linux-image-5.4.0-1040-azure, linux-image-5.4.0-1036-gke, linux-gkeop, linux-image-raspi, linux-image-raspi-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-kvm, linux-oracle-5.4, linux-image-5.4.0-1029-raspi, linux-gcp, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge, linux-image-lowlatency, linux-aws, linux-image-lowlatency-hwe-18.04, linux-oracle, linux-image-raspi-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-66-generic-lpae, linux-image-gkeop-5.4, linux-image-aws, linux-image-lowlatency-hwe-18.04-edge, linux-gkeop-5.4, linux-hwe-5.4, linux-image-virtual-hwe-18.04, linux-image-azure, linux-image-5.4.0-1038-oracle, linux-image-generic-hwe-18.04, linux-image-oracle, linux-image-azure-edge, linux-image-oracle-edge, linux-raspi, linux-kvm, linux-image-5.4.0-1038-aws, linux-image-virtual, linux-image-aws-edge, linux-image-5.4.0-66-generic, linux-image-gke-5.4, linux-image-generic-lpae-hwe-18.04, linux-raspi-5.4, linux-image-generic-hwe-18.04-edge, linux-image-oem-osp1, linux-aws-5.4, linux-gcp-5.4, linux-image-oem, linux-image-gcp, linux-image-gcp-edge, linux-image-raspi2, linux-image-generic-lpae, linux-gke-5.4, linux-image-5.4.0-1037-gcp, linux-image-5.4.0-1033-kvm, linux-image-generic, linux-image-5.4.0-1010-gkeop, linux-image-gkeop, linux, linux-image-5.4.0-66-lowlatency, linux-azure
• USN-4751-1: linux-image-raspi, linux-image-generic-64k, linux-image-5.8.0-1016-raspi, linux-image-5.8.0-1023-gcp, linux-image-5.8.0-1024-aws, linux-image-5.8.0-44-generic, linux-image-generic-hwe-20.04, linux-image-gke, linux-image-kvm, linux-image-raspi-nolpae, linux-gcp, linux-image-virtual-hwe-20.04, linux-image-oem-20.04, linux-image-5.8.0-1021-oracle, linux-image-lowlatency, linux-aws, linux-oracle, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1023-azure, linux-image-aws, linux-image-5.8.0-1019-kvm, linux-image-virtual-hwe-20.04-edge, linux-image-azure, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-44-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-kvm, linux-raspi, linux-image-generic-hwe-20.04-edge, linux-hwe-5.8, linux-image-virtual, linux-image-lowlatency-hwe-20.04-edge, linux-image-gcp, linux-image-5.8.0-44-generic-64k, linux-image-generic-lpae, linux-image-5.8.0-44-generic-lpae, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1016-raspi-nolpae, linux, linux-azure
• USN-4752-1: linux-image-5.6.0-1048-oem, linux-oem-5.6, linux-image-oem-20.04
• LSN-0082-1: generic-4.4, gkeop, gkeop-5.4, generic-4.15, gke, gke-5.4, lowlatency-4.4, gcp, lowlatency-5.4, gke-4.15, lowlatency-4.15, generic-5.4, oem