Linux kernel vulnerabilities

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

-   Ubuntu 18.04 LTS
-   Ubuntu 20.04 LTS
-   Ubuntu 16.04 LTS
-   Ubuntu 14.04 ESM

Summary

Several security issues were fixed in the 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-oem - Linux kernel for OEM systems

Details

It was discovered that the F2FS file system implementation in the Linux
kernel did not properly perform bounds checking on xattrs in some
situations. A local attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2020-0067)

It was discovered that the Serial CAN interface driver in the Linux
kernel did not properly initialize data. A local attacker could use this
to expose sensitive information (kernel memory). (CVE-2020-11494)

Mauricio Faria de Oliveira discovered that the aufs implementation in
the Linux kernel improperly managed inode reference counts in the
vfsub_dentry_open() method. A local attacker could use this
vulnerability to cause a denial of service. (CVE-2020-11935)

Piotr Krysiuk discovered that race conditions existed in the file system
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash). (CVE-2020-12114)

Or Cohen discovered that the AF_PACKET implementation in the Linux
kernel did not properly perform bounds checking in some situations. A
local attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2020-14386)

Hador Manor discovered that the DCCP protocol implementation in the
Linux kernel improperly handled socket reuse, 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-2020-16119)

Giuseppe Scrivano discovered that the overlay file system in the Linux
kernel did not properly perform permission checks in some situations. A
local attacker could possibly use this to bypass intended restrictions
and gain read access to restricted files. (CVE-2020-16120)


Update instructions

The problem can be corrected by updating your kernel livepatch to the
following versions:

Ubuntu 18.04 LTS
    aws - 72.1
    generic - 72.1
    lowlatency - 72.1
    oem - 72.1

Ubuntu 20.04 LTS
    aws - 72.1
    aws - 72.2
    azure - 72.1
    azure - 72.2
    gcp - 72.1
    gcp - 72.2
    generic - 72.1
    generic - 72.2
    lowlatency - 72.1
    lowlatency - 72.2

Ubuntu 16.04 LTS
    aws - 72.1
    generic - 72.1
    lowlatency - 72.1

Ubuntu 14.04 ESM
    generic - 72.1
    lowlatency - 72.1


Support Information

Kernels older than the levels listed below do not receive livepatch
updates. If you are running a kernel version earlier than the one listed
below, please upgrade your kernel as soon as possible.

Ubuntu 18.04 LTS
    linux-aws - 4.15.0-1054
    linux-azure - 5.0.0-1025
    linux-gcp - 5.0.0-1025
    linux-oem - 4.15.0-1063
    linux-oracle - 5.0.0-1000
    linux - 4.15.0-69

Ubuntu 20.04 LTS
    linux-aws - 5.4.0-1009
    linux-azure - 5.4.0-1010
    linux-gcp - 5.4.0-1009
    linux-oem - 5.4.0-26
    linux - 5.4.0-26

Ubuntu 16.04 LTS
    linux-aws - 4.4.0-1098
    linux-azure - 4.15.0-1063
    linux-hwe - 4.15.0-69
    linux - 4.4.0-168

Ubuntu 14.04 ESM
    linux-lts-xenial - 4.4.0-168


References

-   CVE-2020-0067
-   CVE-2020-11494
-   CVE-2020-11935
-   CVE-2020-12114
-   CVE-2020-14386
-   CVE-2020-16119
-   CVE-2020-16120


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