Executive Summary

Summary
Title Linux kernel (HWE) vulnerabilities
Informations
Name USN-4069-2 First vendor Publication 2019-08-01
Vendor Ubuntu Last vendor Modification 2019-08-01
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-4069-1 fixed vulnerabilities in the Linux kernel for Ubuntu 19.04. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 19.04 for Ubuntu 18.04 LTS.

It was discovered that an integer overflow existed in the Linux kernel when reference counting pages, leading to potential use-after-free issues. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-11487)

Jann Horn discovered that a race condition existed in the Linux kernel when performing core dumps. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2019-11599)

It was discovered that the ext4 file system implementation in the Linux kernel did not properly zero out memory in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol (HIDP) implementation in the Linux kernel did not properly verify strings were NULL terminated in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2019-11884)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-5.0.0-23-generic 5.0.0-23.24~18.04.1
linux-image-5.0.0-23-generic-lpae 5.0.0-23.24~18.04.1
linux-image-5.0.0-23-lowlatency 5.0.0-23.24~18.04.1
linux-image-generic-hwe-18.04 5.0.0.23.80
linux-image-generic-lpae-hwe-18.04 5.0.0.23.80
linux-image-lowlatency-hwe-18.04 5.0.0.23.80
linux-image-snapdragon-hwe-18.04 5.0.0.23.80
linux-image-virtual-hwe-18.04 5.0.0.23.80

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://usn.ubuntu.com/4069-2
https://usn.ubuntu.com/4069-1
CVE-2019-11487, CVE-2019-11599, CVE-2019-11833, CVE-2019-11884

Package Information:
https://launchpad.net/ubuntu/+source/linux-hwe/5.0.0-23.24~18.04.1

Original Source

Url : http://www.ubuntu.com/usn/USN-4069-2

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-667 Insufficient Locking
50 % CWE-416 Use After Free

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 3301

Alert History

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0
Date Informations
2019-08-01 13:19:05
  • First insertion