1. Ubuntu Security Notices
  2. USN-4419-1

USN-4419-1: Linux kernel vulnerabilities

Publication date

6 July 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that a race condition existed in the Precision Time
Protocol (PTP) implementation in the Linux kernel, leading to a use-after-
free vulnerability. A local attacker could possibly use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2020-10690)

Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into de-referencing a
NULL pointer. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2020-10711)

It was discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)

It was discovered that the...

It was discovered that a race condition existed in the Precision Time
Protocol (PTP) implementation in the Linux kernel, leading to a use-after-
free vulnerability. A local attacker could possibly use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2020-10690)

Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into de-referencing a
NULL pointer. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2020-10711)

It was discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)

It was discovered that the USB Gadget device driver in the Linux kernel did
not validate arguments passed from configfs in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash) or possibly expose sensitive information. (CVE-2020-13143)

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
16.04 xenial linux-image-4.4.0-1076-kvm –  4.4.0-1076.83
linux-image-4.4.0-1110-aws –  4.4.0-1110.121
linux-image-4.4.0-1135-raspi2 –  4.4.0-1135.144
linux-image-4.4.0-1139-snapdragon –  4.4.0-1139.147
linux-image-4.4.0-185-generic –  4.4.0-185.215
linux-image-4.4.0-185-generic-lpae –  4.4.0-185.215
linux-image-4.4.0-185-lowlatency –  4.4.0-185.215
linux-image-4.4.0-185-powerpc-e500mc –  4.4.0-185.215
linux-image-4.4.0-185-powerpc-smp –  4.4.0-185.215
linux-image-4.4.0-185-powerpc64-emb –  4.4.0-185.215
linux-image-4.4.0-185-powerpc64-smp –  4.4.0-185.215
linux-image-aws –  4.4.0.1110.114
linux-image-generic –  4.4.0.185.191
linux-image-generic-lpae –  4.4.0.185.191
linux-image-kvm –  4.4.0.1076.74
linux-image-lowlatency –  4.4.0.185.191
linux-image-powerpc-e500mc –  4.4.0.185.191
linux-image-powerpc-smp –  4.4.0.185.191
linux-image-powerpc64-emb –  4.4.0.185.191
linux-image-powerpc64-smp –  4.4.0.185.191
linux-image-raspi2 –  4.4.0.1135.135
linux-image-snapdragon –  4.4.0.1139.131
linux-image-virtual –  4.4.0.185.191
14.04 trusty linux-image-4.4.0-1074-aws –  4.4.0-1074.78
linux-image-4.4.0-185-generic –  4.4.0-185.215~14.04.1
linux-image-4.4.0-185-generic-lpae –  4.4.0-185.215~14.04.1
linux-image-4.4.0-185-lowlatency –  4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc-e500mc –  4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc-smp –  4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-emb –  4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-smp –  4.4.0-185.215~14.04.1
linux-image-aws –  4.4.0.1074.71
linux-image-generic-lpae-lts-xenial –  4.4.0.185.162
linux-image-generic-lts-xenial –  4.4.0.185.162
linux-image-lowlatency-lts-xenial –  4.4.0.185.162
linux-image-powerpc-e500mc-lts-xenial –  4.4.0.185.162
linux-image-powerpc-smp-lts-xenial –  4.4.0.185.162
linux-image-powerpc64-emb-lts-xenial –  4.4.0.185.162
linux-image-powerpc64-smp-lts-xenial –  4.4.0.185.162
linux-image-virtual-lts-xenial –  4.4.0.185.162

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References

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