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amazonAmazonALAS2-2021-1699
HistoryAug 13, 2021 - 5:31 p.m.

Important: kernel

2021-08-1317:31:00
alas.aws.amazon.com
47

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.8 High

AI Score

Confidence

High

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

0.0004 Low

EPSS

Percentile

5.3%

JSON

Issue Overview:

A flaw was found in the Linux kernel’s KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability. (CVE-2021-22543)

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.

New Packages:

aarch64:  
    kernel-4.14.243-185.433.amzn2.aarch64  
    kernel-headers-4.14.243-185.433.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.243-185.433.amzn2.aarch64  
    perf-4.14.243-185.433.amzn2.aarch64  
    perf-debuginfo-4.14.243-185.433.amzn2.aarch64  
    python-perf-4.14.243-185.433.amzn2.aarch64  
    python-perf-debuginfo-4.14.243-185.433.amzn2.aarch64  
    kernel-tools-4.14.243-185.433.amzn2.aarch64  
    kernel-tools-devel-4.14.243-185.433.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.243-185.433.amzn2.aarch64  
    kernel-devel-4.14.243-185.433.amzn2.aarch64  
    kernel-debuginfo-4.14.243-185.433.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.243-185.433.amzn2.i686  
  
src:  
    kernel-4.14.243-185.433.amzn2.src  
  
x86_64:  
    kernel-4.14.243-185.433.amzn2.x86_64  
    kernel-headers-4.14.243-185.433.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.243-185.433.amzn2.x86_64  
    perf-4.14.243-185.433.amzn2.x86_64  
    perf-debuginfo-4.14.243-185.433.amzn2.x86_64  
    python-perf-4.14.243-185.433.amzn2.x86_64  
    python-perf-debuginfo-4.14.243-185.433.amzn2.x86_64  
    kernel-tools-4.14.243-185.433.amzn2.x86_64  
    kernel-tools-devel-4.14.243-185.433.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.243-185.433.amzn2.x86_64  
    kernel-devel-4.14.243-185.433.amzn2.x86_64  
    kernel-debuginfo-4.14.243-185.433.amzn2.x86_64  
    kernel-livepatch-4.14.243-185.433-1.0-0.amzn2.x86_64

Additional References

Red Hat: CVE-2021-22543

Mitre: CVE-2021-22543

OSVersionArchitecturePackageVersionFilename
Amazon Linux2aarch64kernel< 4.14.243-185.433.amzn2kernel-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64kernel-headers< 4.14.243-185.433.amzn2kernel-headers-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64kernel-debuginfo-common-aarch64< 4.14.243-185.433.amzn2kernel-debuginfo-common-aarch64-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64perf< 4.14.243-185.433.amzn2perf-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64perf-debuginfo< 4.14.243-185.433.amzn2perf-debuginfo-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64python-perf< 4.14.243-185.433.amzn2python-perf-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64python-perf-debuginfo< 4.14.243-185.433.amzn2python-perf-debuginfo-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64kernel-tools< 4.14.243-185.433.amzn2kernel-tools-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64kernel-tools-devel< 4.14.243-185.433.amzn2kernel-tools-devel-4.14.243-185.433.amzn2.aarch64.rpm
Amazon Linux2aarch64kernel-tools-debuginfo< 4.14.243-185.433.amzn2kernel-tools-debuginfo-4.14.243-185.433.amzn2.aarch64.rpm
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7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.8 High

AI Score

Confidence

High

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

0.0004 Low

EPSS

Percentile

5.3%

JSON
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