CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:C/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
100.0%
Issue Overview:
An updated kernel release for Amazon Linux has been made available which prevents speculative execution of indirect branches within the kernel. This release incorporates latest stable open source Linux security improvements to address CVE-2017-5715 within the kernel and builds upon previously incorporated Kernel Page Table Isolation (KPTI) that addressed CVE-2017-5754. Customers must upgrade to the latest Amazon Linux kernel or AMI to effectively mitigate the impact of both CVE-2017-5754 and CVE-2017-5715 on MMU privilege separation (kernel mode vs. user mode) within their instance.
Customers with existing Amazon Linux AMI instances should run the following command to ensure they receive the updated package:
<i>sudo yum update kernel</i>
As is standard per any update of the Linux kernel, after the yum update is complete, a reboot is required for updates to take effect.
Please refer to https://aws.amazon.com/security/security-bulletins/AWS-2018-013/ for additional information regarding CVE-2017-5754.
Updated on 2018-01-06: Additional KPTI improvements.
Updated on 2018-01-09: Updated details
Updated on 2018-01-13: Additional fixes for CVE-2017-5715
Affected Packages:
kernel
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update kernel to update your system. You will need to reboot your system in order for the new kernel to be running.
New Packages:
noarch:
kernel-doc-4.9.76-38.79.amzn2.noarch
src:
kernel-4.9.76-38.79.amzn2.src
x86_64:
kernel-4.9.76-38.79.amzn2.x86_64
kernel-headers-4.9.76-38.79.amzn2.x86_64
kernel-debuginfo-common-x86_64-4.9.76-38.79.amzn2.x86_64
perf-4.9.76-38.79.amzn2.x86_64
perf-debuginfo-4.9.76-38.79.amzn2.x86_64
python-perf-4.9.76-38.79.amzn2.x86_64
python-perf-debuginfo-4.9.76-38.79.amzn2.x86_64
kernel-tools-4.9.76-38.79.amzn2.x86_64
kernel-tools-devel-4.9.76-38.79.amzn2.x86_64
kernel-tools-debuginfo-4.9.76-38.79.amzn2.x86_64
kernel-devel-4.9.76-38.79.amzn2.x86_64
kernel-debuginfo-4.9.76-38.79.amzn2.x86_64
Red Hat: CVE-2017-5715, CVE-2017-5754
Mitre: CVE-2017-5715, CVE-2017-5754
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:C/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
100.0%