1. Ubuntu Security Notices
  2. USN-4393-1

USN-4393-1: Linux kernel vulnerabilities

Publication date

10 June 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the Marvell WiFi-Ex Driver in the Linux kernel did
not properly validate status lengths in messages received from an access
point, leading to a buffer overflow. A physically proximate attacker
controlling an access point could use this to construct messages that could
possibly result in arbitrary code execution. (CVE-2020-12654)

It was discovered that memory contents previously stored in
microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY
read operations on Intel client and Xeon E3 processors may be briefly
exposed to processes on the same or different processor cores. A local
attacker could use this to expose sensitive information. (CVE-2020-0543)

It was discovered that the Marvell WiFi-Ex Driver in the Linux kernel did
not properly validate status lengths in messages received from an access
point, leading to a buffer overflow. A physically proximate attacker
controlling an access point could use this to construct messages that could
possibly result in arbitrary code execution. (CVE-2020-12654)

It was discovered that memory contents previously stored in
microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY
read operations on Intel client and Xeon E3 processors may be briefly
exposed to processes on the same or different processor cores. A local
attacker could use this to expose sensitive information. (CVE-2020-0543)

Update instructions

Please note that the mitigation for CVE-2020-0543 requires a processor microcode update to be applied, either from your system manufacturer or via the intel-microcode package. The kernel update for this issue provides the ability to disable the mitigation and to report vulnerability status. 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
12.04 precise linux-image-3.2.0-147-generic –  3.2.0-147.194
linux-image-powerpc-smp –  3.2.0.147.161
linux-image-3.2.0-147-powerpc-smp –  3.2.0-147.194
linux-image-powerpc –  3.2.0.147.161
linux-image-generic –  3.2.0.147.161
linux-image-generic-pae –  3.2.0.147.161
linux-image-highbank –  3.2.0.147.161
linux-image-3.2.0-147-highbank –  3.2.0-147.194
linux-image-virtual –  3.2.0.147.161
linux-image-3.2.0-147-generic-pae –  3.2.0-147.194
linux-image-3.2.0-147-powerpc64-smp –  3.2.0-147.194
linux-image-3.2.0-147-virtual –  3.2.0-147.194
linux-image-server –  3.2.0.147.161
linux-image-powerpc64-smp –  3.2.0.147.161

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References

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